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One's 21st birthday when they get completely piss drunk and throw up everything that is in their digestive tract including some internal organs. There is the possibility of throwing up to the extent that you end up swimming in your puke. If you don't know how to swim, you will die on your barfday because you will drown in your own stomach acid and partially digested food.
"I just woke up in the hospital after my epic barfday."
barfday by brizzledho May 19, 2009
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One's 21st Birthday, when it's customary to drink 21-shots plus one for "good luck"
Jim: Hey, how was your birthday?

Kyle: I had 6 shots of JB, 3 of Jager, 5 of vodka, and chased the 8 shots of tequilla and I didn't boot.

Jim: Dude, you've got crazy tolerance, I'm glad you had a happy Barfday.

-------

Adam: Hey how was your 21st barfday?

John: I puked twice at the bar and woke-up face-down in the toilet. I don't remember anything else. It rocked!
Barfday by xchikax April 6, 2006
Your barfday is the date you most recently threw up. e.g., I threw up January 11th, 2024 so that is my barfday. If i get to 1/11/2025 without throwing up again i get to celebrate my first barfday! You may have many first barfdays throughout your life, but eventually you may find yourself celebrating your 20th barfday, or even more!
Tomorrow is my 6th barfday! What a stupid night that was, i should've eaten something first.
barfday by j0nthegreat August 6, 2024

Barfday reset

A barfday reset is any event when you throw up, vomit, barf, puke, etc. You've expelled your stomach contents, you now have a new barfday.
I was hoping to celebrate my barfday next Thursday, but last night I had the grossest barfday reset ever. Chowder, EVERYWHERE.

My 5yr old son just reset his barfday this morning, I'm going to have to work from home today.
Barfday reset by j0nthegreat August 6, 2024

Happy Barfday 

What you say to someone when it's their birthday and they are drunk af and vomitting everywhere
John: this is the best birthday party ever! Oh no... (vomits)
Joe: Happy Barfday John!!!
Happy Barfday by memes are dead October 3, 2016
The date of one's birth.
I be spendin' a fiddy or a c-note on my shorty's berfday jus' fo some 20 inch dubs.
berfday by rapmasta November 4, 2003
how 50 says birthday
we gon party like it's yo burfday
burfday by pimp ass mofo April 16, 2003