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What is not referred to as a gang, but a "brotherhood" that makes up their own words and does drugs. It was started by some white and mexican stoners in the Waterloo/Cedar Falls area of Iowa. It stands for "George Keetness Garbage."
"Whoa, dude, look at that group of G.K.G.'s beating up that little black kid!"

"Yeah, I know man, but it's okay though because I just scored some good shit from those bastards!"
G.K.G. by SBOY467 October 18, 2008

G-K-ing it 

Trying to act gangster, and failing. Employed by many stupid white girls who want to get laid by the basketball team. Consists of wearing FUBU, chains and employing ebonics in everyday conversation.
"What up ho?"
"Dude, stop G-K-ing it, you look like an idiot!"
G-K-ing it by Seanius April 25, 2006
"Guitar Knock(ed)-Out"

Used to describe any action or event that leads to the overuse of a guitar, resulting in soreness in the arms/fingers and mental/physical incapacitation.
When he got his new amp, he got G.K.O.'ed because he practiced too much.

I needed to learn so many new songs for my debut, I was G.K.O.'ed.
G.K.O. by Guit' Muasta March 16, 2008
G.K.O. by synchrogenized September 24, 2016

G.K. on the bridge for 7 elixir

When one is at the end of their wits and decides to do something completely fucking stupid and out of context
I was so cooked in the test i played a G.K. on the bridge for 7 elixir!
What did you do?
I gooned on the test!
your watching a sport when you shout N.G.K.O
N.G.K.O by Ishi D May 7, 2011