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something that sucks horribly; stupid; fake; talentless
that new jay-z joint is wack as fuck.
wack by zach November 25, 2002
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.
wack by Giorgio Enziano April 20, 2008
Hip hop artists (MCs, DJs, B-boys, etc) who are typically aspiring and full of themselves, yet their style is an insult to real hip hop because it (1) copies another artist's style, (2) is mainly driven by commercial aspirations, or (3) is basically incompetent with no hope of improving. Wack = weakly executed flashy moves in place of true substance.
Even the wackest rapper can be a commercial success with a major label behind him.
wack by psychicoctopus August 7, 2004
Exp. To give something a negative stature.
"Man, that is wack, yo!"
Wack by aerosol October 28, 2003
wack is like crazy but it can also mean weird or unbelievable(in a bad way).
"bro john dyed his hair purple"
"thats wack"
"nope im being fr"

"johns project is wack"
"lmao yeah"
wack by wacKosix9 October 14, 2019
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)
wack by Dan Bowen March 13, 2008