verb: to choke under pressure.
He would have taken the lead, but gacked on a 2-foot putt.
بواسطة R. Snot أغسطس/آب 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!
بواسطة maddawg 101 مارس/آذَار 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!!!
بواسطة Griffin.vsMcCahill أكتوبر/تشرين الأوّل 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!
بواسطة johnireland أكتوبر/تشرين الأوّل 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"

بواسطة James 26 نوفمبر/تشرين الثّاني 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"
بواسطة Cane مايو/أيار 1, 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.
بواسطة J.J.W. نوفمبر/تشرين الثّاني 22, 2004

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