To slip, trip, fall, or generally mess something up. Generally resulting in embarrassment and regret.
Sam - slips in mud
Ryan - YOU GUYS, SAM JUST BIFFED IT!
Sam - Damn it! That was the worst biff ever, I'm fuckin' covered in mud!
(verb)
to accidentally knock into something/hurt yourself by your own strength/physically hurt somebody else.
(noun)
a term of endearment.
'I just biffed myself on the wall' (i just walked into the wall)
'When the train jolted I biffed myself in the face'
'Shutup loser or I'll be forced to biff you'
'HELLO BIFF!'
To throw something with vigour, informal. Cape Breton english
You better not biff that snowball b'y
I biffed that stick right at his face
An easier way of pronouncing the acronym B.F. (Best Friends) or B.F.F. (Best Friends Forever)
Cody: Are we BFFs?
Amber: dude we're BIFFS