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29.
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"

by James 26 November 17, 2005
 
30.
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.
by J.J.W. November 22, 2004
 
31.
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
by R Caron December 04, 2003
 
32.
A man or women's discharge I.E. His or her cum.
I gacked all over her.Or she gacked in my mouth...
by cath boys June 28, 2006
 
33.
to kill someone, something or some idea.
imma gack dat be-yotch!
by Nietzche July 01, 2003
 
34.
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.
by ProjectDiesel December 08, 2008
 
35.
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!
by JesusOfNazareth March 06, 2004