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!
โดย Psionics 17 พฤศจิกายน 2004

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Term used by live and recording soundmen to describe old and broken audio equipment
Take that out of the rack and put it with the rest of the gack in corner
โดย R Caron 04 ธันวาคม 2003

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to kill someone, something or some idea.
imma gack dat be-yotch!
โดย Nietzche 01 กรกฎาคม 2003

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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.
โดย BrightApollo 07 มีนาคม 2003

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A man or women's discharge I.E. His or her cum.
I gacked all over her.Or she gacked in my mouth...
โดย cath boys 28 มิถุนายน 2006

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noun. - Ritalin, Concerta, Vyvance, Adderall, or any other Psycho-Stimulant ADHD Drug.
verb. - the state of mind when on any psychostimulant or adhd drug; usually one listed above
noun - Dude lets buy some Gack tonight.
verb - Dude lets get gacked out.
โดย ProjectDiesel 08 ธันวาคม 2008

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expression used when a hockey player does something significant while playing in a hockey game
GACK! <insert french canadian or eastern european name here> just scored!
โดย JesusOfNazareth 06 มีนาคม 2004

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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