| 1. | to strike with a smart, resounding blow or blows. |
| 2. | Slang. to divide into or take in shares (often fol. by up): Whack the loot between us two. |
| 3. | to strike a smart, resounding blow or blows. |
| 4. | a smart, resounding blow: a whack with his hand. |
| 5. | Informal. a trial or attempt: to take a whack at a job. |
| 6. | Slang. a portion or share. |
| 7. | whack off,
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| 8. | whack out, Slang. to produce quickly or, sometimes, carelessly: She whacks out a short story every week or so. |
| 9. | out of whack, Informal. out of order or alignment; not in proper condition. |
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whack
and wack
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whack (sth)
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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.
[The Jargon File]
whack
In addition to the idioms beginning with whack, also see have a crack (whack) at; out of kilter (whack).