verb: to choke under pressure.
He would have taken the lead, but gacked on a 2-foot putt.
dodane przez R. Snot sierpień 29, 2003

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a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
dodane przez maddawg 101 marzec 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!!!
dodane przez Griffin.vsMcCahill październik 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!
dodane przez johnireland październik 26, 2007

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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"

dodane przez James 26 listopad 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"
dodane przez Cane maj 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.
dodane przez J.J.W. listopad 22, 2004

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