Birthday Salsa

The resulting period blood from having sex on your period.

Yeah last night was fun and all but we got birthday salsa all over the sheets.

by DilapidatedGardenEel February 12, 2026

Birthday Chess

Where one Goes on Chess.com and plays a 10 minute rapid game on said persons birthday

1: so…do you have any plans on your birthday?

2: nah I’ll play some birthday chess

by M@dn3ss February 23, 2026

Birthday Boy

A derogatory term for a trans man that believes in transmisandry.

I can't believe Dylan really thinks trans men are less privileged then trans women... what a birthday boy!

by N. Grimalkin July 31, 2025

Birthday paradox

In probability theory, Birthday paradox is the phenomenon concerning the probability that, in a set of n randomly chosen people, at least two will share the same birthday. The birthday paradox is the counterintuitive fact that only 23 people are needed for that probability to exceed 50%. The birthday paradox is a veridical paradox, i.e. a paradox that produces counter-intuitive results, but is demonstrated to be true nonetheless.

I always thought it was super rare for two people to share a birthday, but the birthday paradox says it only takes 23 people to make it likely!

by Emotional Cruiser September 26, 2025

Birthday effect

Also known as the birthday blues, this effect is a statistical phenomenon where an individual's likelihood of death appears to increase on or close to their birthday, e.g. due to skydiving in order to celebrate birthday

They say there's a birthday effect, so I’m skipping the skydiving this year; I don’t want to become a statistic.

by Emotional Cruiser September 26, 2025

birthday

In The Sims, "birthday" signifies a Sim's progression to the next life stage, triggering aging up through interactive steps like blowing out candles on a birthday cake or automatically the day after the actual birthday. Players can use the game's calendar to prepare for birthdays or manually age a Sim up by baking a cake and having them blow out the candles.

Last night in The Sims, I totally forgot it was my Sim's birthday! I had to scramble to bake a cake and get everyone to sing before she aged up. Thankfully, she blew out the candles just in time and entered her teen phase with a new hairstyle!

by Emotional Cruiser October 9, 2025

Birthday Donut

A crude term for a man’s asshole — the “special treat” he’s been sitting on since birth.

Phrase origin: combines “birthday suit” (naked) with “donut” (a round shape with a hole), creating a tongue-in-cheek term that’s equal parts ridiculous and vivid.

“He was talking big until someone threatened to glaze his birthday donut.”

by Birthday Donut October 14, 2025