Slang Words for Your Period From “Aunt Flo” to “shark week,” slang words for menstrual periods are as colorful as they are creative. Women around the world have coined dozens of playful terms to describe that time of the month.

Some favor nature-inspired phrases like “moon time,” “crimson tide,” or “strawberry week,” while others lean into humor with expressions like “riding the cotton pony” or “the painters are in.”

Many cultures have their own unique versions — the French say “les anglais sont arrivés,” while Germans say “Erdbeerwoche” (strawberry week).

Whether you call it “code red,” “lady days,” or simply “the monthly,” one thing is clear: women have never lacked creativity when it comes to naming this universal experience.

Quick Table

Slang Term	Category	Origin/Notes
Aunt Flo	Visitor	“Flow” = blood flow
Shark week	Funny	Popularized on social media
Crimson tide	Flow	Color reference
Moon time	Nature	Lunar cycle connection
The curse	Classic	Old-fashioned, dramatic
On the rag	Classic	Historical cloth pad use
Strawberry week	Nature	German: Erdbeerwoche
Code red	Classic	Military-style urgency

What Is Slang Words for Your Period?

My cousin once texted me in the middle of a work meeting: “Red wedding started. Need supplies ASAP.”

I completely understood. I texted back, “On my way.” No further explanation needed.

That’s the thing about period slang — it’s a secret language that most people just… know. You learn it from your mom, your older sister, your friends in the school bathroom, the internet at 2 AM when you’re Googling why your cramps feel like a tiny army is staging a revolt inside you.

And honestly? There are so many of these phrases. After going down a rabbit hole (started by curiosity, fueled by a genuinely fun conversation with a group of friends), I counted well over 200 slang terms from different cultures, generations, and countries.

Let me take you through the most interesting ones — and explain where some of them even came from.

Why Do We Have Slang for Periods at All?

Before we dive into the actual terms, let’s just acknowledge the obvious: periods have been taboo in many cultures for a really long time. In some households, you couldn’t even say the word “period” at the dinner table. So people got creative.

Slang became a way to talk about something very normal without making others (or yourself) uncomfortable in certain settings. It also became a way to bond — a kind of inside language among people who experience the same thing.

It’s not all about embarrassment, either. Some of these terms are genuinely funny. Others are weirdly poetic. A few are downright horrifying (but hilarious). Let’s get into it.

The Classic “Visitor” Category

These are the terms that frame your period as someone (or something) showing up uninvited:

• Aunt Flo — Possibly the most well-known. “Aunt Flo is visiting” has been around for decades. The “Flo” is short for “flow,” in case that wasn’t obvious.
• Time of the month — Vague enough to say in front of anyone. Your boss, your grandpa, whoever.
• Monthly visitor — Same energy as above, slightly more formal.
• The crimson wave — Made popular by the movie Clueless in the ’90s. Still gets used unironically.
• Monthly gift — Said with varying levels of sarcasm depending on the day.
• Lady in red — Poetic. Slightly unsettling if someone says it without context.

The Color-Coded Terms

A huge category of period slang just… refers to the color red. Which makes sense, even if some of these made me laugh:

• Red tide — Borrowed from the ocean phenomenon. Evocative, if nothing else.
• Red wedding — (Yes, like Game of Thrones.) This is newer slang, mostly used online.
• Code red — Works perfectly as a text to a friend. Two words, they’ll know.
• Shark week — This one has officially made it into mainstream culture. Discovery Channel probably didn’t intend that.
• Red alert
• Riding the red river
• Strawberry week — Used in some European countries, especially Germany.
• Flying the red flag

The “Out of Order” and Inconvenience Category

This is where the terms get a little dramatic — which, honestly, is fair:

• Out of order — As in, the factory is temporarily closed.
• On the rag — Old-school, slightly crude, but still widely used. Refers to the old practice of using rags before modern period products existed.
• That time — Maximum vagueness achieved.
• My friend is visiting — Often used by younger people or in more conservative settings.
• Monthly madness
• Girl flu — Dismissive, and a lot of people have rightfully moved away from this one.
• Closed for maintenance

The Food and Cooking Terms (Which Are Oddly Specific)

I did not expect this category to be as large as it is, but here we are:

• Ketchup — Used in texts. “Got ketchup” = period started.
• The tomato sauce — Italian-coded slang that somehow exists.
• Strawberry season
• Red velvet week
• Cherry season

Historical and Old-Fashioned Slang

These are terms that your grandmother might have used, or that show up in older literature:

• The curse — This one is actually ancient. It shows up in literature and was used for centuries, usually by people who viewed menstruation as punishment. We’ve moved past that framing, but the term lingers.
• Monthly courses — A Victorian-era term. Very proper.
• Female complaint — Also Victorian. Very not okay by modern standards, but historically documented.
• Indisposed — This was used as a polite way to say someone was menstruating in formal company.
• Unwell — Similar usage. Polite, vague, very 1800s.
• Flowers — Surprisingly, “flowers” was a historical euphemism. As in, the body was “flowering.” Odd but kind of poetic.

International Slang: How Other Countries Talk About It

This is where it gets really interesting. Spending time reading through forums, language blogs, and asking friends from different countries turned up some genuinely wonderful terms:

France:

• Les anglais ont débarqué — “The English have arrived/landed.” This supposedly dates back to when Napoleon’s troops wore red coats. Wild.

Germany:

• Erdbeerwoche — “Strawberry week.” This is cute and widely used.
• Meine Tante aus Hamburg — “My aunt from Hamburg is visiting.” Very similar energy to “Aunt Flo.”

Brazil (Portuguese):

• Chico or Chico chegou — “Chico arrived.” A very casual way to say it, using a man’s name as slang.
• Tia veio — “Auntie came.” Another visitor metaphor.

Japan:

• Seiri (生理) — The clinical term, but also just casually used. Period talk is relatively normalized in Japanese media and product advertising.
• Anoko ga kita (あの子が来た) — “That girl came.” Another visitor metaphor.

Spain:

• Me ha venido la regla — Very straightforward. “My period came.”
• Estar mala — “Being sick/unwell.” Used colloquially.

Russia:

• Kriticheskiye dni (критические дни) — “Critical days.” Dramatic and I respect it.

Italy:

• Le mie cose — “My things.” Vague and oddly charming.
• Il marchese — “The Marquis.” There’s apparently a tradition of giving the period a fancy noble title.

The Internet Generation’s Contribution

The rise of social media and period-positive communities online has added a whole new layer of slang, especially on platforms like Reddit, TikTok, and Twitter/X:

• Shark week (already mentioned, but truly has taken over)
• Murder scene in my pants — Graphic. Accurate. TikTok energy.
• Red wedding — The Game of Thrones reference is strong with this one.
• Monthly dues
• The apocalypse — For particularly heavy flows.
• Crime scene — Similar to murder scene, but slightly more forensic.
• Period era — As in, “I’m in my period era.” Gen Z phraseology.
• Uterine warfare

Apps That Use Their Own Period Slang

If you track your cycle (which — genuinely helpful, even if you don’t have a specific reason to), apps like Clue, Flo, and Natural Cycles have their own ways of handling the language:

• Clue uses clinical, neutral language on purpose. They deliberately avoid calling it “Aunt Flo” or anything cute. Their branding is specifically built around normalizing direct conversation about bodies.
• Flo uses softer language and has a community forum where users have developed their own in-app slang.
• Period Tracker apps in general have started offering customization — you can label your “period” whatever you want in some apps, which has led to people entering their personal slang.

One friend of mine has hers set to “Dragon Week.” I think about that a lot.

Common Mistakes People Make With Period Slang

This might sound like an odd section, but it’s genuinely worth mentioning:

Using vague slang in medical contexts. If you’re talking to a doctor, a nurse, or filling out a health form — use the actual clinical terminology. “Menstruation” or “menstrual period.” Saying “I think Aunt Flo might be irregular” to your gynecologist just creates confusion and potentially miscommunication. Save the slang for your group chat.

Assuming everyone knows the term you’re using. “Strawberry week” doesn’t land the same way with someone who didn’t grow up in Germany. “The crimson wave” might get a blank stare from someone who’s never seen Clueless. Context matters.

Using dismissive terms without reading the room. Phrases like “girl flu” or some older terms can feel belittling, especially if the person you’re talking to is experiencing significant pain or a real medical issue (like endometriosis or PCOS). Slang can be bonding, but it can also accidentally minimize something serious.

The Terms That Are Actually Reclamations

Over the last decade or so, there’s been a noticeable shift in how period slang is used. A lot of people — especially younger generations and period-positive advocates — have started using direct, unapologetic language as a form of reclamation.

Terms like “my period”, “menstruating”, and “my cycle” are being used loudly and without whisper.

Campaigns by brands like Always and Bodyform specifically addressed the way menstruation had been coded in advertising (blue liquid, anyone?) and pushed for more honest representation.

At the same time, playful slang hasn’t gone away. It coexists with directness. You can say “period” in a board meeting and text your friend “shark week just bit me” five minutes later. Both things can be true.

A Quick Reference List (For the Bookmarkers Among Us)

Here’s a condensed list of slang terms across all categories — great for reference, or just for fun:

Visitor-themed: Aunt Flo, monthly visitor, the monthly gift, lady in red, Tom (used in some UK contexts — “time of month” → TOM)

Color/imagery: Red tide, code red, shark week, red wedding, crimson wave, red alert, riding the red river, flying the red flag

Old-fashioned: The curse, indisposed, unwell, monthly courses, flowers

International: Strawberry week (Germany), the English have arrived (France), critical days (Russia), the Marquis (Italy)

Internet/modern: Uterine warfare, murder scene, period era, the apocalypse, crime scene

Everyday casual: That time, time of the month, on the rag, my friend is visiting, closed for maintenance

FAQ’s

What is the most common slang word for a menstrual period?

“Aunt Flo” is arguably the most widely recognized slang term for a menstrual period, used across English-speaking countries for decades.

Why do people use slang words for periods?

Slang terms help reduce embarrassment and stigma around menstruation, making it easier to discuss in public or social settings without discomfort.

Do other countries have their own period slang?

Yes. The French say “les anglais sont arrivés,” Germans say “Erdbeerwoche” (strawberry week), and Italians refer to “il marchese” — every culture has its own colorful expressions.

Where did the term “shark week” come from?

It originated as a humorous social media reference, playing on the Discovery Channel’s popular “Shark Week” programming and the presence of blood in water.

Are slang words for periods harmful or helpful?

When used positively, they can normalize conversation around menstruation. However, overly negative terms can reinforce stigma, so context and tone always matter.

Conclusion

Menstruation is a natural, universal experience shared by roughly half the world’s population, yet for centuries it has been shrouded in silence, shame, and secrecy.

The rich variety of slang words that have emerged across cultures and generations tells a fascinating story about how women have found ways to communicate openly about something society often preferred to keep hidden.

From poetic nature-inspired phrases like “moon time” and “crimson tide” to laugh-out-loud expressions like “shark week” and “riding the cotton pony,” period slang reflects both the creativity and resilience of women everywhere.

These terms are more than just funny nicknames — they are a window into cultural attitudes, historical taboos, and the ongoing journey toward menstrual acceptance.

Today, the conversation around periods is shifting.

Younger generations are increasingly comfortable speaking openly about menstruation, and the playful slang that once existed purely to avoid embarrassment is now being reclaimed as a badge of shared experience and humor.

Whether you grew up saying “Aunt Flo is visiting” or simply “I have my period,” what matters most is that the conversation keeps happening.

Breaking the silence, one slang term at a time, is how stigma slowly loses its power and understanding takes its place.