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

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a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
dari maddawg 101 Rabu, 25 Maret 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!!!
dari Griffin.vsMcCahill Selasa, 30 Oktober 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!
dari johnireland Jumat, 26 Oktober 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"

dari James 26 Kamis, 17 November 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"
dari Cane Minggu, 01 Mei 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.
dari J.J.W. Senin, 22 November 2004

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