gack

v. - to steal, snatch, grab, or otherwise take something into one's possession

I was thirsty, so I gacked a Coke from his fridge.

If you like the ring, gack it when the clerk turns around.

by BlackArthur January 2, 2004

gacked

contraction of gobsmacked

I was totally gacked when I saw that pround was a real word.

by Cythere March 3, 2008

gack

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"

by Cane May 1, 2005

gacked

adj. something that has become so corroded or gummed up with a substance that it is both visbible and fairly disgusting.

The inside of that bowl is so gacked you could sell it.

by aksarah August 24, 2003

GACK!

A word or sound muttered/or written by Professors of Anatomy and Physiology when proper terminlogy is not used. Also used un situations of extreme exacerbation.

Student Answer: Gluteus Med.
Professor Commentary on test: GACK! This is not proper terminology.

"GACK!, be quiet now! Or I will leave!"

by Rojay November 30, 2006

gack

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

gack

The browny black substance found inside a firing tube after a big mix has been smoked through it,It smells terrible and stains lips, clothing and fingers

John smoked a massive bong and got serious gack on his lip.
The bong was covered in gack

by erbivore198999 February 25, 2009