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 1, 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.
بواسطة J.J.W. نوفمبر 22, 2004
The noise that animate objects make when you sharply grab their neck. Most commonly found in birds and humans.
Father: Go ahead and grab it son.
Son: Ok.
Little Boy: gaaacck
Son: Haha! This is fun.
Little Boy: *gasp* aack gaaah!
بواسطة Psionics نوفمبر 17, 2004
A noun used to insult anyone that looks, talks, or acts like a dork.
OMG, don't let Stewart come with us tonight, that dude is a fucking gack.
بواسطة Richard Huang نوفمبر 6, 2004
The unknown fluid or mass created as a result of decomposition.
Dude, you gotta bury that roadkill. That gack is starting to run down the hill.
بواسطة BrightApollo مارس 7, 2003
a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
بواسطة maddawg 101 مارس 25, 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!!!
بواسطة Griffin.vsMcCahill اكتوبر 30, 2007

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