0 to hit someone, especially with the fist (= closed hand):
I biffed him on the jaw.
a biff on the nose
Biff attempts to help his father see what has become of him.
Biff then starts up his auto-detailing business, which he owns and runs by himself, and by 1985 it seems to be quite popular.
Biff is always game for the ladies, but doesn't mind taking lumps for the lads.
Biff waits hours to see a former employer who does not remember him and turns him down.
Biff accidentally hits the button that sends the fuel canister hurtling off into space.
The word derives from the slightly archaic transitive verb, biff which means hit.
The prisoner was taken into a yard, ordered to strip, searched, and then the biff began.
Biff is a large, lazy, cruel bully who obtains what he wants by intimidating others into doing his work for him, or by cheating.
