verb: to choke under pressure.
He would have taken the lead, but gacked on a 2-foot putt.
av R. Snot 29. august 2003
a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
av maddawg 101 25. mars 2009
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!!!
av Griffin.vsMcCahill 30. oktober 2007
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!
av johnireland 26. oktober 2007
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"

av James 26 17. november 2005
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"
av Cane 1. mai 2005
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.
av J.J.W. 22. november 2004
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