Another word for sexual intercourse.
Steven got really drunk last night and he ended up biffing Claire.
by Roddolodd May 26, 2007

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someone you hate very much, they just don't know it.
the opposite of a best friend forever.
oh no here comes the biff. Why doesn't she ever wear a hair tie during races? She is such a freak i hate her so much.
by KAnne123456789 April 25, 2007

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To cum into the eyeball of another.
Sorry babe, but I thought it would be funny to biff and knock out your eye : /
by Vicz0t teh pwnz0r September 07, 2006

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A large amount of fat on the lower stomach of a humain begin. The fat above the crotch. Mostly associated with morbidly obese people.
Damn, that bitch is fat, look at the size of her biff.

The man was so fat that his biff hung between his legs.
by Keiss June 06, 2006

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To smack someone forcefully on the back of the head.
Tom biffed Erik for being an idiot.
by Islington March 07, 2006

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Doing something that is both very dumb and very painful. causes loss of property or health, or both.
JC made a $20K BIFF by crashing his brand new jeep into the pond and boggin it out.

Pat was walking down the stairs at the club and he biffed hard right in front of some hotties.
by ericl May 03, 2005

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to screw something up in any way, minimal or major can constitute the use if the word "Biff".
Don't biff this one up like last time.
by Alex Osmond March 27, 2005

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