food that sticks to the roof of your mouth, also the process of food getting stickier the more you chew it
"this food is really gacky"

de James 26 17 novembre 2005
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.
de J.J.W. 22 novembre 2004
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
de R Caron 4 décembre 2003
A man or women's discharge I.E. His or her cum.
I gacked all over her.Or she gacked in my mouth...
de cath boys 28 juin 2006
to kill someone, something or some idea.
imma gack dat be-yotch!
de Nietzche 1 juillet 2003
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.
de ProjectDiesel 8 décembre 2008
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!
de JesusOfNazareth 6 mars 2004

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