A thick mucousy pocket, burped out of the vaginal opening. (Usually a thick 'army green' colored content, sometimes with redish brown flakes or deposits strewn through out.)
An aroma filled the small office cubicle that Pat shared with Dawn, once the pocket of 'Gak' had forced its' way out of her, popping when hitting the floor.
by Drew G-PHD April 07, 2008
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.
by Dameon Jackson January 17, 2005