Wack, an african american slang word, oftenly used to replace "shit, bad, horrible, not cool, stupid" and any other generally negative words.
Wack, the sound something makes when such an object is either hit or is used to hit another object.
Wack, used to replace "place, put, drop"
"Dude, thats wack"
"Damn, this is wack"
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.
"Just wack it there"
"Wack some of that sauce on my burger, thanks"
2) To Jerk off
Tracy: I'm all that and a bag of chips!..and then some!
Rob: Shut yo wack ass up!.. and gets off my Grill.
Tracy: What did u do last night?
Rob: I was wacking my dick ...RAW... thinking about you.