Meaning

• Egregious.

• Bad (not good), inauthentic, of an inferior quality, contemptible, lacking integrity, lame, or strange.

  "Every record they ever made was straight-up wack."

• Crazy, mad, insane.

• Cool, bizarre, and potentially scary.

Meaning

• The sound of a heavy strike.

• The strike itself.

• The stroke itself, regardless of its successful impact.

• An attempt, a chance, a turn, a go, originally an attempt to beat someone or something.

  "40 bucks a whack."

• (originally Britain cant) A share, a portion, especially a full share or large portion.

• A whack-up: a division of an amount into separate whacks, a divvying up.

• A deal, an agreement.

  "It's a whack!"

• The backslash, ⟨ \ ⟩.

Meaning

• To hit, slap or strike.

• To kill, bump off.

• To share or parcel out; often with up.

  "to whack the spoils of a robbery"

• To beat convincingly; to thrash.

• (usually in the negative) To surpass; to better.