First birthday 

The act of sitting your unwiped ass on your partner's face while teabagging them, then ejaculating in and around their mouth. The end result resembles a baby that smeared cake all over itself at its first birthday party.

I got fired because the security cameras caught me giving Carol a first birthday in the supply closet.

First birthday by Stephen Jung December 9, 2013

Happy Birthday Roddy 

Your a turd you fucking bitch

I really didn't like when roddy missed the fantasy football draft. He was sure acting like a Happy Birthday Roddy.

Happy Birthday Roddy by Croddy March 9, 2016

eighteenth birthday 

When you become a legal adult and you can make your own decisions but your parents or any one older than you thinks you are still a child.

"It's her eighteenth birthday so she's going to get a tattoo."
"She thinks she's so grown because its her eighteenth birthday."

eighteenth birthday by Theimpracticaljokersarestilltr April 3, 2016

floating birthday

Cerebrating someones birthday a few days / months before or after their actual birth-date.

She has a floating birthday because she was born on a leap year so we just celebrate whenever works best.

floating birthday by Foxcraft August 30, 2016

Over-birthday 

The day after one's birthday.

So now that its your Over-birthday, how does it feel being 16 and a day old?

Over-birthday by PikminThePikmin June 28, 2016

dirty birthday clown 

When you are having anal sex with someone and they fart and it feels like your dick is being blown up like an animal balloon. Similar to jet wash

This chick last night gave me a dirty birthday clown and all morning my whiz has been sputtering, but the jet wash felt great on my balls.

dirty birthday clown by Donny Bratsco December 12, 2016

Bleather Birthday 

A Southern California regional holiday in which participants use their own birthdays to honor the modern legacy of Bleather by Blucas. Bleather by Blucas is a range of leather apparel developed by "Blucas," an amalgam of the fictional character Riley Finn from the Buffyverse and the actor that portrays him, Marc Blucas.

How fortunate that your Bleather Birthday coincides with Bleather by Blucas' release of his new fall line "Bleather Betrayal."

Bleather Birthday by Bleather Boo September 5, 2017