When you tell your girlfriend you'll pick her up for a romantic dinner and desert ( ;) )and completely forget her.
" ya biffed it bud!"
" ya biffed it bud!"
by Simple.life January 3, 2015

When someone hits something really hard, sometimes used in cricket matches when a batsman proper smashes the ball. I think it originates from the old batman show when they had fights with the bad guys. Sometimes words came up in bubble writing when someone got hit, an one of the words the used was biff.
by Tom Tench May 16, 2008

If someone is "biffing" they are lying or exaggerating about a situation. It can also be used by calling someone a "biffer" if they are known to lie.
He's a big BIFFER, ket sniffer, clit flicker.
Oi! Quit biffin you little rapscallion!
Mum's comin' up da stairs! nah, quit biffing bro.
Oi! Quit biffin you little rapscallion!
Mum's comin' up da stairs! nah, quit biffing bro.
by BigBiffer July 29, 2020

by Hasbro July 8, 2006

n. Bif The Wizard; The leek wielding mascot of science depicted as a stick figure. BiF's name originates from the elements Beryllium and Fluoride. Is often associated with the word BiFtastic, meaning absolutely nothing whatsoever.
Dude: That's a BiF if I've ever seen one.
Other Dude: What's a BiF?
Dude: I don't know.
Other Dude: Woah... Deep...
Other Dude: What's a BiF?
Dude: I don't know.
Other Dude: Woah... Deep...
by NNBTK October 30, 2009

/bɪfd/
1. to be proved wrong when previously displaying a cocky attutude of being right.
2. Generally humiliated in some pride-before-a-fall kinda way
3. to be disappointed, gutted etsech
1. to be proved wrong when previously displaying a cocky attutude of being right.
2. Generally humiliated in some pride-before-a-fall kinda way
3. to be disappointed, gutted etsech
by Ghettoling August 6, 2010

by BIF hunter March 17, 2013
