Australian slang used alot lately showing someone not interested in doing something, or one who is lazy.
Robert: Hey lets go to the shop
Sam: Naa, slack!
by Karina September 09, 2004

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To not get your dick up; not have a boner.
"She looked down and this cock was totally slack"
by Johnny Luna January 23, 2014

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Slang for the prescription anti anxiety medication xanax.
Damn, that chick was all zipped up on the slacks. It's no wonder she can't remember what happened last night.
by red rob September 23, 2010

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An adjective that describes any orifice that has seen copious amounts of penis or similar object (e.g. broom).
Alan: Good Lord! Your bumhole is extraordinarlily slack, I doubt my penis would even touch the sides.

Jill: What can I say, I like penis.
by DaftusCuntus September 27, 2009

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The absence of rules. Especially dogmatic or stupid rules that constrict freedom in modern humans. Slack in it's purest form is freedom.
Give me some slack . . . Jack!
by Vidaddy September 28, 2008

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absence of rules . . . wholly grail for a Subgenius
"Cut me some slack . . . Jack"
by CruiserBob September 18, 2008

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Something that is disgusting, unpleasant, and offensive to the eye.

Just down-right nasty!!

"Oh my damn"!! Why in the hell did that girl put on that!!!!! She looks so SLACK!!!

2) Lets say that some1 dose something nasty. and You say
"yo SLACK ass!!!

3) When you hear something that is Nasty. you say
"Awww that sounds Slack!!"
by Luv 2Shady December 26, 2005

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