look up any word, like ratchet:
 
15.
Lord Meth in the battle thread
Lord Meth's rhymes are wack
by emseed September 07, 2008
 
16.
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
 
17.
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
 
18.
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
 
19.
to kill someone, in the mob
He disrespected me, so I wacked him.
by coach_max September 21, 2012
 
20.
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
 
21.
a very cool term. Used to describe someone when they say or perform an action that is admired by others.
dude, amanda is so wack
by awahlstedt May 26, 2011