Birthday Bash 

An informal British way to say Birthday Party.
Bash meaning party, and bashment meaning a large party.

Rob's having a surprise birthday bash for Kendall next month, and the theme is Drunk Chihuahuas!

Birthday Bash by KonTriByuTur July 27, 2021

Birthday Bash 

The overly excessive amount of facebook notifications one receives on his/her birthday due to mainly people that person never talks to wishing them a happy birthday.

I was trying to creep on Courtney's profile, but she got birthday bashed and I didn't feel like scrolling through all of the wall posts

Birthday Bash by Carl from Jimmy Neutron January 26, 2011

Birthday Bash 

Where friends beat the person with a birthday.

We’re going to Fuchs Quinn up at his birthday bash.

Birthday Bash by Obcpanther February 7, 2023

Birthday Bash 

To celebrates one's birthday by having intercourse with one's girlfriend or boyfriend.

My girlfriend gave me the best birthday bash last night!

Birthday Bash by bnksns April 1, 2009

Birthday Bash 

The day directly in between two birthdays

"Whose birthday is it? Oh neither of theirs, this is their birthday bash, the day directly in between Austin and Paul's birthdays"

Birthday Bash by Fletcher420 March 28, 2020

Birthday Bash 

The act during sexual intercourse, when right bfore the male climax he pulls out just before ejaculation. Proceeding to defocate on his partners face and then ejaculate on the feces. Therfor covering the shit with semen looking like a birthday cake or a plethora of other things.

Person 1 = "Hey man totally pulled a fake out when i birthday bashed Lindsey!"

Person 2 = "Radical!!!"

Birthday Bash by Demolition Man June 24, 2010

Birthday Bash 

When you strip down to your "birthday suit" and wack someone in the face with your boner.

Awe dude, how was your sister's birthday bash?
Have you given your lady a birthday bash recently?

Birthday Bash by da_jew April 23, 2017