to kill someone, in the mob
He disrespected me, so I wacked him.
by coach_max September 21, 2012

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1. Something shitty, old or inferior.
2. An amazing Mindless Self Indulgence song.
1. Jim: Did you see Joe's gig last night?

Rick: Yeah man, that shit was wack!
2. My shit is wack! Oh oh oh, ho oh oh! Down to defy niggaz and my double-wide niggaz!
by BringThePineapples December 19, 2011

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The term "Wack" is a word used to describe any "musical" "artist" who is enough of a sell out to feature on national television.
An example of a wack artist would be:

Every artist you know and listen to.
by The1PersonWhoIsSmarterThanYou January 14, 2011

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a white and black person
Hey is Tom white or black?
Neither he's wack.
by imANanon December 23, 2010

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tha complete sh*t, a fly lil' momma,..a true rider,...
wacktackuliar, wackalicious, wack-around, wanna-wack?, once u've been wack, u never go back,.....as in,....jackee
by wackwack May 15, 2010

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used to describe:

1)any person who, regardless of reasoning, just can't pull the right moves to be with the 'in' crowd

2) any failed attempt at a cool stunt or complex pick-up line

3) an overly dressed or tacky person
1) After witnessing the new kids outdated dance moves, the clicke of 'cool' kids declared him wack and moved on to the next wannabe.

2) As the kid dusted himself off after failing at a double beer chug, one of the girls muttered to her friend" wow, that boy is wack!"

3)As the jeri-curled, headband wearing, oversized pendant bearing thirty year old made his way towards the party from his rusty el camino sittin on 20's, about fifteen people asked their friends 'who's this wack mo-fo?'
by The_Enigma_of_all_enigmas_1109 February 23, 2010

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1)
Wack, an african american slang word, oftenly used to replace "shit, bad, horrible, not cool, stupid" and any other generally negative words.

2)
Wack, the sound something makes when such an object is either hit or is used to hit another object.

3)
Wack, used to replace "place, put, drop"
1)
"Dude, thats wack"
"Damn, this is wack"

2)
As Kiwi hits Flamin over the head with a baseball bat repeatedly the room goes dark, all you can hear is a repetitive "wack, wack, wack" followed by a cry of pain.

3)
"Just wack it there"
"Wack some of that sauce on my burger, thanks"
by Not Kiwi January 13, 2010

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt