biff

verb5

1. •
   (informal) To punch or hit.

   • ‘But ’twas Fitzgerald who was goin’ to biff Malone, man, can’t you understand?’ old Tom interrupted. — 1911
2. •
   (informal) To wipe out; to faceplant; to fall.
3. •
   (informal) To mess up.
4. •
   (New-Zealand, slang) To discard; to throw out; to throw away.
5. •
   To move quickly.

noun2

1. •
   (informal) A sudden, sharp blow or punch.

   • "Hit him a biff," said the Big Man. — 1945
2. •
   (informal) A wipeout.

exclamation1

1. •
   The sound of a person being punched or hit.

   • Whap, Biff, Ooooof, Sock, Pow, Zok! Batman is back. Gotham City is again leaving its law and order in the hands of a man who wears plastic underpants over his tights. — 1989

phrase1

1. •
   Acronym of brief, informative, friendly, firm, a conflict resolution approach to responding to hostility.