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!
Psionics가 작성 2004년 11월 17일 (수)

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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
R Caron가 작성 2003년 12월 04일 (목)

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to kill someone, something or some idea.
imma gack dat be-yotch!
Nietzche가 작성 2003년 07월 01일 (화)

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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.
BrightApollo가 작성 2003년 03월 07일 (금)

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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...
cath boys가 작성 2006년 06월 28일 (수)

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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.
ProjectDiesel가 작성 2008년 12월 08일 (월)

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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!
JesusOfNazareth가 작성 2004년 03월 06일 (토)

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