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1. adj; something in bad taste or is otherwise unappealing.

2. verb; to murder someone.

3. verb; to masturbate.
1. Yo Freddy, turn off the country music. That shit is whack.

2. Freddy, turn off that fuckin' country music before I go and whack ya.

3. Freddy, I said turn off the country music, I didn't say pull your johnson out and start whackin' it. The fuck?
by Eapert McDangles June 29, 2006
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the sound that a whip makes.
"Get back to work!"

mush mush *Whack* mush *Whack*
by WordRepoMan April 05, 2013
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1. adjective; appalling in nature, unconventional.

2. verb; to strike one with the hand or fist.

3. verb; to assassinate.
1. yo, that's whack.

2. if your mother heard that she'd whack you upside the head.

3. you want we should whack a dog?
by bud newman. February 28, 2003
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1) When power is applied on a diesel locomotive and then engine revs up.
2) People shout WHACK when window hanging behind a diesel locomotive, when it revs up and starts to thrash.
"Whack it up driver!"

*driver applies power on the loco*
by Tomton THD June 18, 2020
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1. Street slang, meaning "bad".
2. To assassinate another "mo-fo".
3. Nickelwhack
1. "Man, that's whack!"
2. Tony the legitimate Sicilian businessman got whacked.
3. Hairy Canadian band.
by Schubert November 26, 2003
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