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From The Collaborative International Dictionary of English v.0.48:
Whack \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.] [1913 Webster] Rodsmen were whackingtheir way through willow brakes. --G. W. Cable. [1913 Webster] 2. To divide into shares; as, to whack the spoils of a robbery; -- often with up. [Slang] [Webster 1913 Suppl.]