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 November 18, 2007

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 7, 2003

gack

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"

by James 26 December 28, 2005

Gack

The noise that animate objects make when you sharply grab their neck. Most commonly found in birds and humans.

Father: Go ahead and grab it son.
Son: Ok.
Little Boy: gaaacck
Son: Haha! This is fun.
Little Boy: *gasp* aack gaaah!

by Psionics November 17, 2004

gack

A man or women's discharge I.E. His or her cum.

I gacked all over her.Or she gacked in my mouth...

by cath boys June 29, 2006

gacking

When your cat gets a random huge energy burst and runs around the house jumping on stuff and knocking things over like a little shit head.

I didn't get much sleep cause my cat was gacking all night.

by Friendlytoad May 19, 2016