Definitions by Dameon Jackson

gak 

A popular Nickolodeon slime, available in many variations such as glow in the dark, speckled, cocoanut smelling, etc. Useful for making fart noises, grossing out friends or as sexual lubricant.

Sweetie, we ran out of KY gelly, go get some of your step daughter's Gak.

gak by Dameon Jackson January 17, 2005