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Throwing up vigorously and loudly. It's worse than yacking.
Upon learning that she could get pregnant by swallowing sperm, she began instantly gacking on her new shoes.
gacking by RBV and Ice October 4, 2016
Related Words
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.
gacking by Friendlytoad May 19, 2016
When you stick your penis/clit into a active power outlet in hopes of getting electrocuted till you cum in pleasure.
Will gacking in English Class! It was so crazy!
Gacking by KrispyCum March 11, 2025

gacking off 

when a guy jacks off without showering for a couple of days (2 OR MORE).
BOB: today i was gacking off
gacking off by chivorey March 26, 2009

Ganking Zone 

A location in a jail where an inmate is easily jumped or killed by fellow inmates or guards without being noticed.
The warden's snitch got killed in the gankin zone and there were no whitnesses.

Lyrics from Eazy E's "Eazy Does It"

"The bitch was a trip cold hung up the phone, now my only phone call was in the ganking zone."
Ganking Zone by Def Dr. April 25, 2006
Gakking is the act of getting laid out in a druggy haze. Typically from opioids, tranquilizers, or benzos.

You can Gak, get Gakked, Gak Out... but in any case, you are Gakking.
No, I wasn't sleeping, I was just gakking on some Xanax
Gakking by Jacaranda March 26, 2020