Gack 

To get messed up in the process of putting the team on your back and still going out like a champ.

His night would have been better if he hadn't Gacked after the race.

Gack by bww13 December 6, 2010

Gack 

Gack is not a word but an emotion of pain and joy. And also a good word to say after dabbing on the haters

I have severe autism, gack

Gack by Joebo kenysville February 19, 2019

Gack 

In certain social groups, it's come to mean "to kill violenty". Typically by means of strangulation. It can also mean being shot from time to time but the latter is it's more common use. Either way, to be 'gacked' means to be killed violently and or by surprise. But strangely, is almost always used in jest or a playful nature.

"im gonna gack you, if you keep fucking around with me." (Non-serious tone)

Gack by WeeLilFaggot February 27, 2020

gack 

Another word for cocaine

Come on lets go and buy a big bag of gack

gack by tomo April 26, 2004

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.

gack by BlackArthur January 2, 2004

Gack 

Used to describe female pyhsique. Particularly her stomach and breasts. When a female's stomach sticks out further then her breasts. aka (When her gut sticks out further then her rack)

She's got a Gack
When her gut sticks out further then her rack.

Gack by Rob K July 24, 2006

Gack 

When you fuck your bitch so hard that her pussy makes a farting sound much like the nickelodeon puddy like material "gack"

Yo dude, last night I gacked the shit out of ashley's pussy.

Gack by ScuryJerry January 20, 2006