Whack

v. t.	1.	To strike; to beat; to give a heavy or resounding blow to; to thrash; to make with whacks. [imp. & p. p. Whacked ; p. pr. & vb. n. Whacking.] 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.
v. i.	1.	To strike anything with a smart blow. To whack away to continue striking heavy blows; as, to whack away at a log.
n.	1.	A smart resounding blow.
	2.	A portion; share; allowance.
	3.	an attempt; as, to take a whack at it. Out of whack out of order.

Noun	1.	whack - the sound made by a sharp swift blow
	2.	whack - the act of hitting vigorously; "he gave the table a whack" Synonyms: whang, knock, rap, belt
Verb	1.	whack - hit hard; "The teacher whacked the boy" Synonyms: wallop, wham, whop

whack - According to arch-hacker James Gosling, to "...modify a program with no idea whatsoever how it works." (See whacker.) It is actually possible to do this in nontrivial circumstances if the change is small and well-defined and you are very good at glarking things from context. As a trivial example, it is relatively easy to change all "stderr" writes to "stdout" writes in a piece of C filter code which remains otherwise mysterious.

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