Top definition
something that really sucks.

also a quote from a vine where a black man just yells
his hair? WACK
his gear? WACK
his jewelry? WACK
his foot stance? WACK
the way he talks? WACK
the way he doesn’t even like to smile? WACK
me? I ‘ M T I G H T A S F U C K
by olivaègay November 28, 2018
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Nov 27 Word of the Day
A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.
That fucking smooth brain put his shirt on backwards again...

That smooth brain is dumber than a pile of shit.
by Tip Tank May 14, 2011
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2
Perplexingly unsavory; “off”; unusual/weird in a bad or uncomfortable way; confusing and unsettling; hard to understand (and often not worth the effort to try to understand)
Yeah, that math teacher was bad, but the school just fired him out of the blue!
That’s wack, dude.
by IstanbulKedi June 15, 2019
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3
an adjective used to refer to something crazy, weird, and/or unbelievable
Amir: Yo, did you see mr. brown break dancing in his cow costume?
Zach: Yeah, that was wack bro
by ur b1tch November 22, 2019
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4
Something that just plain sucks, or isn't cool at all. Lame.
by Ben November 22, 2003
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5
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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6
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
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