verb: to choke under pressure.
He would have taken the lead, but gacked on a 2-foot putt.
ayon kay R. Snot ika-29 ng Agosto, 2003
a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
ayon kay maddawg 101 ika-25 ng Marso, 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!!!
ayon kay Griffin.vsMcCahill ika-30 ng Oktubre, 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!
ayon kay johnireland ika-26 ng Oktubre, 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"

ayon kay James 26 ika-17 ng Nobyembre, 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"
ayon kay Cane ika-01 ng Mayo, 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.
ayon kay J.J.W. ika-22 ng Nobyembre, 2004

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