a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
by maddawg 101 March 25, 2009

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the hard crusty substance found on a mans used underpants
Deirdre: jesus john, the gack on your boxers! no way i'm riding you now!!!
by Griffin.vsMcCahill October 30, 2007

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gack is a word meaning unpleasant repulsive disgusting hideous nauseating can be applied to ppl food drink music and pete doherty!
jesus look at her shes a pig shes gack!!
this lasagne is gack who th hell taught you to cook??!!
pete doherty is gack!
by johnireland October 26, 2007

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Used to describe female pyhsique. Particularly her stomach and breasts. When a female's stomach sticks out further then her breasts. aka (When her gut sticks out further then her rack)
She's got a Gack
When her gut sticks out further then her rack.
by Rob K July 24, 2006

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food that sticks to the roof of your mouth, also the process of food getting stickier the more you chew it
"this food is really gacky"

by James 26 November 17, 2005

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The slimy substance (usually green) that was dumped on people in earyl Nickelodeon tv shows
"Thats the incorrect answer so you get drenched by a bucket of gack"
by Cane May 01, 2005

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Similar to a circus "geek", a "gack" is a circus performer who sucks farts out of chickens.
It was amazing how the circus gack was able to withdraw flatulence from the hens and roosters.
by J.J.W. November 22, 2004

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