a lame gangsta slang word for cool.
"Dayum, that CD sounds wack!"
by Daddiyo July 10, 2008

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When something goes or is worng. Also used in place of fucked up.
1)Man, that shit is wack!
by Americus Nationel October 27, 2004

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To "Beat off" or "Choke the Chicken" or "beat the meat" or "rub the eye".
Also known as Rob's main agenda.
Hold on a sec while I wack it...
by tyler bauhaus March 09, 2003

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the wireless Stephen uses
me: hey steve wussup
stephen: hi im aight u
stephen signed off at 3:30 pm
stephen signed on at 3:31 pm
stephen signed off at 3:32 pm
stephen signed on at 3:33 pm
stephen signed off at 3:34 pm
stephen signed on at 3:35 pm
me: ur wireless is WACK
stephen signed off at 3:36pm
by lmao im not slackin May 31, 2008

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See weed aka pot.
Yo man, git me so dat wack.
by Grizzle February 20, 2005

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Wack, in actual fact, means really really good.
it was originally used to replace the word weak (uncool) but ironically came to mean the exact opposite (un-uncool... ie cool).
Toby: that Alioop was wack man!
Jimeny: sure thang dawg...it was pretty f***ing cool!
by The Hot Rod January 21, 2008

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A verb, doing word. Used by teenagers of high intelligence who can create a code between themselves.
"Wack us the remote"

"Wack us a phone call"

"When you get the chance wack us some smack"

"Wack us some of ya mahd"
by Mr.Universe November 27, 2005

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