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13.
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
 
1.
1) Lame, sorry ass, aint even legit

2) To Jerk off
Example 1:

Tracy: I'm all that and a bag of chips!..and then some!

Rob: Shut yo wack ass up!.. and gets off my Grill.

Example 2:

Tracy: What did u do last night?

Rob: I was wacking my dick ...RAW... thinking about you.
by Shady Ass Rob February 04, 2003
 
2.
Something that just plain sucks, or isn't cool at all. Lame.
The new star wars movies are so wack.
by Ben November 22, 2003
 
3.
1. To be of low or dubious quality. Origin: comes from 'whacky', which evolved to 'whacked' or 'whacked out'. Eventually shortened to 'wack'. The 'h' is usually dropped to differentiate the meaning from 'whack', which is to hit something hard or, kill (old wise guy terminology).
Yo, my dog, those shoes are wack.
by Paul October 13, 2004
 
4.
something that sucks horribly; stupid; fake; talentless
that new jay-z joint is wack as fuck.
by zach November 25, 2002
 
5.
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.
by psychicoctopus August 07, 2004
 
6.
Exp. To give something a negative stature.
"Man, that is wack, yo!"
by aerosol October 28, 2003
 
7.
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