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"
por Cane 01 de Maio de 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.
por J.J.W. 22 de Novembro de 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!
por Psionics 17 de Novembro de 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.
por Richard Huang 06 de Novembro de 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.
por BrightApollo 07 de Março de 2003
a name for a sexual organ, usually the female one.
oh man wouldnt mind of bit of that gack!
por maddawg 101 25 de Março de 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!!!
por Griffin.vsMcCahill 30 de Outubro de 2007

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