A sex act where you have a threesome with an ATF agent's mother and wife, preferably rapidly and without a condom.
Did you hear the ATF raided Jim after he bragged about how he did a machine gun?
When an individual calls dibs on being the driver.
I got a machine gun!
When someone calls the front right seat of a car, they shout out shotgun! But this one is for machine gun seat out on the back of the pickup truck. Ya know ww2, willys jeep.
Shotgun!
Fine! Machine gun! keep your lousy shotgun seat! Bad ass number one in the backseat! Weehaa!
Fully sick arm muscles (see guns) are the key to attracting females also known as honeys (see huns)
John: But do you have abs?
Bruce: No I don't but I have good arms
John: Sweet, guns get the huns mate
When someone has an enormous penis
Yo, that machine gun dick is like 20 inches!
When someone has a big dick
Yo, that machine gun dick you got there is like 20 inches, fam
when a cat robs a bank with a gun.
thats a cat and gun dude, watch out.