Birthday Cupcake 

When a girl totally makes a wish that the dude won't cum on her ass and he still does.

Cindy hated the texture and taste of Tom's jizz and even though she didn't want it he still jacked his sweet frosting all over her buttocks and "voila" Birthday Cupcake.

Birthday Cupcake by cavein December 15, 2011

Birthday Her Son 

To inseminate a girl, resulting in the birth of a child, preferably a boy.

You know that fine chick last night? I'm gonna birthday her son.

Birthday Her Son by Paul Dinh May 3, 2007

birthday tally 

When a friend asks you to make-out with someone for their birthday.
The person is usually very cute (which makes it a challenge) or not that attractive but nice so they deserve some action.

Claire: "Molly, will you birthday tally Kevin K. for my birthday?"
Molly: "Of course, it might be a bit hard tho cuz he's such a babe and not a manwhore."

birthday tally by Risque Munsell 7 girls November 25, 2007

birthday suit 

A legal proceeding that you file against a stripper, seeking monetary compensation for the disappointment you suffered when he/she didn't "bare it all" for your once-a-year special occasion.

Exotic dancers should always take out indemnity-insurance against birthday suits.

birthday suit by QuacksO June 14, 2018

birthday crash 

this is a brithday party that is great in everyway except for the part when the mom comes home and ragingly drunk and stoned kids scramble for their lives.

claras birthday was so rad until her mom came, then the party was birthday crashed.

birthday crash by long eyelashes September 14, 2003

birthday cap 

when someone purchases cotton pajama pants and sleeps in them multiple times (commando styleand not wash them), then procedes to take them, sneeks behind someone and and put their head in the pajama pants

Pajama pants may be substituted with another pantaloon made of a breathing fabric that retains odor, preferably cotton

I snuck up behind my brother and gave him a birthday cap.

birthday cap by Rico R. April 26, 2005

Birthday Salad 

Fecal Matter (n.) which takes different forms, i.e. a sandwhich, fruit, chips, cake.

It's your birthday and you are very hungry. You must eat a birthday salad.

Birthday Salad by Quoreen Kwyn May 2, 2011