Sacramento Birthday Party 

when you take a shit in your buddy's mouth and then he gives you a blowjob

Hey Brian, I know it's your birthday today so after work let me throw you a Sacramento Birthday Party

Sacramento Birthday Party by Gambino's Schling Schlong September 27, 2017

Half Birthday 

I know you all are hot n popular and you have so many full birthdays to celebrate, so why should you bother with a half-assed attempt at your half birthday? Because it's the Best. Day. Of. The. Year. Nobody cares about your half birthday (please make no exception for mine), so do you and do it up, but don't do too much because it's your half birthday. I'm eagerly awaiting an invite to your halfway decent celebration.

Emma's half birthday is coming up on Feb 1. At half past one, she's taking her friends hiking. At half past six, they're making half-assed pizzas. They'll finish off the festivities by getting half baked and playing half a game of something or other.

Half Birthday by EvPlatt January 27, 2020

happy bit-lated birthday 

spoonerism for happy belated birthday.

this message can be posted on a facebook wall between a week to 364 days of the date of the event in question:

- dude, sorry i forgot, happy bit-lated birthday, man.

happy bit-lated birthday by augustonovato April 22, 2010

Monkey's Birthday 

A day characterized by rain and sun at the same time.

It's raining and it's sunny out; it must be a monkey's birthday!

Monkey's Birthday by Forty-n-Eight December 13, 2007

sad birthday

Originally used as a birthday that does not go very well, later bastardized into any unfortunate happenstance

Birthday Boy: Oh a surprise party? Awesome! thanks guys! ....Wait a minute...there are only 2 balloons? that's it, I'm leaving...SAD BIRTHDAY!

or

Jazzy: Man, It's 3 AM and I still have a lot of homework to do...I guess I have to pull an all-nighter...
V.M: Saaaaad Birthday

sad birthday by Danny-Matt October 6, 2009

angel birthday 

When someone passes away, their birthday every year after is known as their angel birthday.

Tomorrow will be my grandpa's 5th angel birthday. He has had 5 birthdays since he's passed.

angel birthday by Queen_of_Me June 22, 2017

halloween birthday

Someone who’s birthday on Halloween is a bad bitch they are rude or dies for their friends and will make anyone laugh

damn She has a Halloween birthday she a thicc jawn

halloween birthday by Playboy3000 November 6, 2019