birthday boy

A form of crybullying where a person provokes someone and then immediately acts weak to make them look like the bad guy.

I dated a 5'8 guy who'd taunt every jacked, 6'3 bro he met until they'd pull their fist back to beat him up, whereupon my ex would go
"heyheyheyyy c'maahn I'm a little guy, I'm just a little guyy, noo, it's also my birthday, l'm a little birthday boy" & it somehow always worked

by RappinPicard February 11, 2026

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 nyash

Basically pussy/ass for you birthday as a gift

Yo bro my girl just gave me some birthday nyash as a gift

by Nigakiga April 22, 2025

birthday position

For his birthday, he gets to choose how they will make love. The position is therefore called birthday position.

My husband can ask me all year round if we do it this way, but I always answer: it's not your birthday. This is your birthday position!
My wife has also invented an Urban Dictionary word. It's both appealing and bitter: the birthday position.

by ThePhysopher May 4, 2025

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