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"

بواسطة James 26 نوفمبر 17, 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"
بواسطة Cane مايو 1, 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
بواسطة R Caron ديسمبر 4, 2003
to kill someone, something or some idea.
imma gack dat be-yotch!
بواسطة Nietzche يوليو 1, 2003
A man or women's discharge I.E. His or her cum.
I gacked all over her.Or she gacked in my mouth...
بواسطة cath boys يونيو 28, 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.
بواسطة ProjectDiesel ديسمبر 8, 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!
بواسطة JesusOfNazareth مارس 6, 2004

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