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

gack

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

by R Caron December 05, 2003

gack

gack is a word meaning unpleasant repulsive disgusting hideous nauseating can be applied to ppl food drink music and pete doherty!

jesus look at her shes a pig shes gack!!
this lasagne is gack who th hell taught you to cook??!!
pete doherty is gack!

by johnireland October 26, 2007

gack

the hard crusty substance found on a mans used underpants

Deirdre: jesus john, the gack on your boxers! no way i'm riding you now!!!

by Griffin.vsMcCahill October 30, 2007

gack

to kill someone, something or some idea.

imma gack dat be-yotch!

by Nietzche July 02, 2003

gack

verb: to choke under pressure.

He would have taken the lead, but gacked on a 2-foot putt.

by R. Snot August 29, 2003

gack

The unknown fluid or mass created as a result of decomposition.

Dude, you gotta bury that roadkill. That gack is starting to run down the hill.

by BrightApollo March 07, 2003