The nasty stuff you spit up when you have been snorting meth or coke.
That fuckin methhead covered the deck in gack spit!
by crazyfock November 7, 2003
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The substance in between a man's ass cheeks that creates skid marks. Also known as butt butter, gack in the crack is usually formed as a result of several components put together. These are:
1) A hairy ass
2) A moist defecation followed by clean up with cheap TP
3) Physical exertion that causes the hairy ass to perspire
Mike took a hurried dump in the portajohn outside the stadium and then went back to tailgating. It was a long walk back to the pickup and the hot weather made him sweat. By the time he got back to the beer cooler he had some gack in the crack.
by Wiseman July 14, 2006
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To be real real real high, on meth, crack, PCP or whatever gets you fuzzy!
I was nekkid gacked out and shootin' at the cops.
I acquired all this copper wire when I were gacked out!
That bitch is gacked the fuck out!
by rusty squeezebox June 13, 2008
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The term used to describe the dry state of one's mouth from the intense lack of saliva. It can cause the lips to stick to the teeth and gums, and is often caused by smoking cannabis.
I have Gack Mouth. My mouth is Gacky.
by Tom Linds April 5, 2008
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Get your Gack out!

My Gack smells fishey
by Jacko September 23, 2004
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The nasty taste in ones mouth caused when meth is smoked and dissolved into the gums then slowly comes out and coats the inside of the mouth.
damn I gotta brush my teeth 20 times I have some serious gacked mouth.
by gacklow October 22, 2010
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The gunk that builds up in and around the keyboard/mouse of a gamer.
"I just cleaned about 10 pounds of gamer gack out of my keyboard yesterday. It was really satisfying"
by OmarWodd May 29, 2020
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