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
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The state of being wack. A measure of the degree to which someone or something is wack. Alternatively, an exclamation indicating a high degree of wackness in the general surroundings.
I sense wackness emanating from these emcees.
by cazort October 14, 2004
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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 5, 2003
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When you commentating a ping-pong ball match
Guy 1: hits ping pong ball
Guy 2: hits ping pong ball
You, the commentator: wack wack wack wack wack wack
by foop629 August 18, 2019
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Movie that came out in 2008 starring Ben Kingsley as an offbeat psychotherapist (Dr. Jeffrey Squires), Josh Peck as his drug-dealing 18 year old patient (Luke Shapiro), and Olivia Thirlby as the psychiatrist's daughter (Stephanie) whom Luke falls in love with.

Mary-Kate Olsen makes an appearance as a hippie with dreads.

Was actually a decent movie. Made you laugh and cry and left you feeling overall pretty good.

Proved that every now and then Nickelodeon stars can in fact be talented. Josh Peck's performance was incredible.
Have you seen The Wackness yet? Makes you think twice about Josh Peck.
by blarghle August 10, 2009
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just plain crazy...and fun......out of this world......
she's wacked out..... I know I am......... nice
by ur best friend June 5, 2006
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something that sucks horribly; stupid; fake; talentless
that new jay-z joint is wack as fuck.
by zach November 25, 2002
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