Wack - crap, shitty, no good.

A word used verbally by those who see themselves and their peers as gangster.
For someone to define something as wack, theyre saying its shit.
Person 1: Yo, you want a drag of this?
Person 2: Nah that shit is wack.
by Giorgio Enziano April 20, 2008

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adj,'publicly decreed to be not very good by those of taste and distinction. That which makes an effort to achieve the approbation of the cultural vanguard but fails due to a lack of authenticity'

The word is of uncertain etymology. It first emerged from the highly non-standard forms of ebonics used by New York rappers in the late 1980s and early 1990s.
Because Kriss Kross, is wiggedy wiggedy wack! (Kriss Kross, 'Jump', 1992)

...cuz it's a fact if you wack, you ain't sayin' jack! (Gangstarr, 'Check The Technique', 1991)
by Dan Bowen March 13, 2008

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used prodominently by the mafia - to kill; to kill without notice of others
Nicky and Tony wacked the drug lord
by Billko July 06, 2005

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Wack is another way of saying you suck,your crap etc
Dawg did you hear that kid rap he was wack!
look at there crew it's wack
by Lil Ace October 10, 2004

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the spot between your back and your crack.
the wack is that hairy spot at the bottom of your back before your crack.
by colorian July 02, 2009

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One who is wacked.

Reject via popular (and in some cases unpopular) crowd.
me: "Dude, you know CJ?"
Danny: "Yeah, dude, he's such a wack now, ever since he started playing RuneScape and tried to talk to people about it."
by patrick_is_sexy September 19, 2007

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bad,not good. sometimes used in freestyle battlin'.
"you're shit was wack!"
by brixx May 23, 2005

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