Whack v. t. [imp. & p. p. Whacked p. pr. & vb. n. Whacking.]
  1. To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.  [Colloq.]
     Rodsmen were whackingtheir way through willow brakes.   --G. W. Cable.
  2. To divide into shares; as, to whack the spoils of a robbery; -- often with up. [Slang]
  whacked
       adj : (British informal) exhausted or worn out