Someone so high on meth they move uncontrollably. This usually includes wildly exaggerated leg ,hip, arm and butt movement that often look like their moving to some unknown beat and looks like very much like the dance the Elaine character on Sinefeld does.
I can't be around her when she tweeks , she turns into a gack dancer moving all crazy like that.
by Kris burkholder June 8, 2017
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Ashley aint cleanin her cooter and booty hole properly sooo, now she got sticky shit in the region in between.
Kayla: Yo Ash got gack
Person: Ew tell her not to get that on my car seats
by hayley1708 April 10, 2018
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A condition caused by taking to much methication. If your geeked+twacked while hypermethalating with your jaw crooked, you might be Gacked! Js
Did you see that hooker in the alley way? She was so Gacked she was sucking off a dog!
by J Milluh February 13, 2020
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"oi conor"
"cunt im gacked"
by joeysmatekevin September 27, 2018
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A state of hightned awareness and focus attained through copious amounts of meth use and prolonged lack of sleep.
"man that neighbor is mowing his yard again,doesn't he know it's three am?!man he's gacked!"
by October 28, 2021
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Guy 1: omg bruh you look so fucking Gacked Rn Fr

Guy 2: omg bro I feel gacked as shit Rn, got any gumm?
by AnonymousSally September 7, 2020
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Being gacked means to be horrendously intoxicated and high at the same time. It is like being crossfaded but on a much worse level. You cannot truly describe what feeling “gacked” is like until you actually get to that level.

The best way to describe being gacked is feeling disgusting, on a different planet, unable to speak or walk, vague memory of the present, almost unachievable motor functions, nausea, headache, dry mouth and sore throat.

Key things to pay attention to are droopy eyes, unable to lock on or focus on certain things, sounds are distorted and completely distant, speaking to people is an almost impossible task as you can’t pay attention, and a tingly nose are usually good sign.

People who are at this level are people you need to be careful of, they are not blacked out but are useless and can be hurt or taken advantage of.

Gacked people usually look like they are sleeping in an uncomfortable fashion. They can see, but their eyes are barely open, their mouths are usually wide open as well. Responses are just grunts and head nods and it’s almost impossible to move them.

When you take care of someone at this level, make sure you lay them on their back or side and sleep close to them as they may wake up and vomit.
Ty: I have no idea what happened last night man.

Jase: You were gacked. That’s why.

Ty: Seriously? What do you mean?

Jase: You looked dead, you were hanging over the arm rest of the couch and couldn’t talk or move.

Ty: Shit man. I feel horrible, don’t let me get to that point again.
by SpazzMoto September 10, 2019
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