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"

από James 26 17 Νοέμβριος 2005
The slimy substance (usually green) that was dumped on people in earyl Nickelodeon tv shows
"Thats the incorrect answer so you get drenched by a bucket of gack"
από Cane 1 Μάιος 2005
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
από R Caron 4 Δεκέμβριος 2003
to kill someone, something or some idea.
imma gack dat be-yotch!
από Nietzche 1 Ιούλιος 2003
A man or women's discharge I.E. His or her cum.
I gacked all over her.Or she gacked in my mouth...
από cath boys 28 Ιούνιος 2006
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.
από ProjectDiesel 8 Δεκέμβριος 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!
από JesusOfNazareth 6 Μάρτιος 2004

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