guns of the navarone 

1961 movie staring Gregory Peck and Anthony Quinn about the WWII capture of a Nazi-Held Greek gun battery.
Often used metaphoricly to articulate pent-up anger or frustration.

I'm a mushroom-cloud layin' mother fucker, mother fucker. I'm superfly on TNT, I am The Guns Of The Naverone.

-Samuel L Jackson, Pulp Fiction
(also referanced in "Wonderland" with val kilmir)

guns of the navarone by bubsy hayden November 23, 2004

Gunscrub 

Video gaming term. Used to describe someone who denies any use of a melee ability or weapon at close range in a video game.
Can be used as an insult or a rage comment.

"Hey gunscrub, ever heard of a knife?"
"Hey fagola, stop being a gunscrub and knife that CT already!"

Gunscrub by whatawonderfulduwang September 18, 2014

gunimski 

The act of hitting yourself in the face with a large 120mm tank round.

dude did you just gunimski yourself?
Yea the round hit me in the face.

gunimski by Tanker19k February 22, 2015

Gunnar Gehl 

An amazing sweet human being who cares about his fans. His only form of communication is insta hearts, the fire emoji, :)), and “love”. He is also a Californian surfer dude.

Gunnar Gehl is so soft and talented

Listen to heartbeat by Gunnar Gehl on YouTube

Gunnar Gehl by Givegunnargehljustice February 18, 2019

Gunbir 

An elegant man that is very good with woman. Gunbir is very good looking and is blessed down below. Gunbir is also very academically inclined and He is also very wealthy and is very humble

“Omg Loot at Gunbir he’s so sexy”

Gunbir by Jordan.A September 11, 2020

Pulling Out The Big Guns 

Use the most powerful method/treatment to any underlying problem or illness when other methods/treatments fails.

Medical Term: I couldn't sleep for a week! Time to start pulling out the big guns!
Problematic Term: Couldn't solve this problem using common methods. Time to start pulling out the big guns!

Pulling Out The Big Guns by Kylem14843 July 20, 2018

Gunshine State 

The State of Florida. A play on words on "Sunshine State" Called this because it's shaped kinda like a gun. Also because there have been more concealed weapons permits issued in Florida than any other state in the Union. 1 in every 49 Floridians has a concealed carry permit.

Criminal 1: Hey lets go mug that old granny over there.
Criminal 2: Hell no this is the Gunshine State she'll blow us away!

Gunshine State by jackbauer24 December 9, 2006