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.
by brizzledho May 20, 2009
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.
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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!
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.
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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!
by xchikax March 24, 2006
by memes are dead October 3, 2016