To borrow or steal internet content from another user.
I gacked this meme from lamebrain426.
by florimell August 09, 2003

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Very good marijuana bud. A superior strain of cannibus that has been found on display at the cannibus cup at least twice.
I got the GACK y0. y0y0 I'll give you 5 oz. of this gack I just got from vantown for a grand and a blowjob from your gf.
by Seattle (Big A) May 01, 2005

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derogatory term for cunt
Get your Gack out!

My Gack smells fishey
by Jacko September 23, 2004

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When you fuck your bitch so hard that her pussy makes a farting sound much like the nickelodeon puddy like material "gack"
Yo dude, last night I gacked the shit out of ashley's pussy.
by ScuryJerry January 15, 2006

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A word used by a fucking idiotic British person who tried to create his own language while playing video games on YouTube.
Gavin of Achievement Hunter used the word 'gack' and was promptly called a fucking idiot.
by Fjrgdkenj June 14, 2016

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

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The Urban Dictionary T-Shirt

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