(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
a replacement for a curse word, can be replaced in any way
“shut the hell up you biff”
“man YOU shut up biff 🙄”
or
“you motherbiffer, how could you?!”