a person that has just finished smoking cristal meth
by Anonymous April 3, 2003
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I was totally gacked when I saw that pround was a real word.
by Cythere March 3, 2008
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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.
by aksarah August 25, 2003
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Methamphetamine (crank, speed). Describes the gag reflex triggered by the extreme burning sensation of the nasal passages when the drug is snorted, and the very bitter taste as it drains down the back of the throat.
The character 'Pooh-Bear' in the movie "The Salton Sea" had to have his nose surgically removed because he snorted too much gack.
by Anonymous July 14, 2003
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To be under the influnce of crack or cocaine.
Dude me and my friend bumped an 8-ball last night...we got so gacked.
by *k!nG Br@nDoN* March 9, 2005
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Person: Did you know that Marilyn Manson loves gacking?
Another person: No way!!
Person: Really? Of all the things he's into, THIS, surprises you? Wow. I'm tweeting this convo, ya twat!
by KingFobos March 22, 2016
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Any amount of useless or unwanted stuff (usually regarding possesions)
I've got too much damn gack in my attic. Guess I'll throw something on ebay.
by mudpup April 5, 2006
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