GNU Collaborative International Dictionary of English

Found 3 definitions

1.       
   Whack (?), v. t. [imp. & p. p. Whacked (?); p. pr. & vb. n. Whacking.] [Cf. Thwack.]
   1. To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks.  [Colloq.]
   
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   Rodsmen were whackingtheir way through willow brakes. G. W. Cable.
   
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   2. To divide into shares; as, “to whack the spoils of a robbery”; -- often with up. [Slang]
   
   [Webster 1913 Suppl.]
   
   
         
       

2.       
   Whack, v. i. To strike anything with a smart blow.
   
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   To whack away, to continue striking heavy blows; as, “to whack away at a log”. [Colloq.]
   
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3.       
   Whack, n.
   1. A smart resounding blow.  [Colloq.]
   
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   2. A portion; share; allowance. [Slang]
   
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   3. an attempt; as, “to take a whack at it.” [Colloq.]
   
   [PJC]
   
   -- Out of whack, out of order. [Slang]
   
   [Webster 1913 Suppl.]