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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"
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adj. something that has become so corroded or gummed up with a substance that it is both visbible and fairly disgusting.
The inside of that bowl is so gacked you could sell it.
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A really nasty substance. Like ear wax, saliva, boogers etc.
"Dude! Your ear phones are full of gack!"
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A word or sound muttered/or written by Professors of Anatomy and Physiology when proper terminlogy is not used. Also used un situations of extreme exacerbation.
Student Answer: Gluteus Med.
Professor Commentary on test: GACK! This is not proper terminology.
"GACK!, be quiet now! Or I will leave!"
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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.
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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.
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