Top Definition
Verb. The act of vomiting on someone's taint. Regurgitation induced from over zealous sac suckage or fellatio.
Man, he was thrusting so hard I underbarfed.
by tuottosjohnson February 05, 2010

Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.

×