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It is usually used in rap to describe the action To shoot at someone without hesitation
I Ain't ever lacking I pump gas with my gun out
Pump gas by ♤ Spade June 1, 2025

golden gas pump 

When a woman tugs on a man's flaccid penis while urinating. She tugs on it in a fashion so that she is getting sprayed like gasoline coming out of a nozzle.
Guy 1: Gina is such a whore.
Guy 2: Why, did she offer to give you a golden gas pump?
Guy 1: Yeah, and I totally went for it.
golden gas pump by awesomesaus December 20, 2012

michigan gas pump 

Fuck a girl with your cock, hence the pump. Once the vagina is dilated, fart in the orifice. Hence the gas. Michigan, because that's where my last girlfriend was from.
Girl: I'm from michigan

Guy: Can I give you a michigan gas pump?

Girl: Only if it is high octane.
michigan gas pump by krautmonkey December 19, 2013

Gas Pump Thrust

The act of thrusting the gas nozzle in and out of the tank after filling up in order to remove excess gas in the nozzle to prevent dripping onto the side of your car.
Ron: damn it I always spill gas on my car after filling up

Jeremy: you gotta remember to get all the liquid out with a quick gas pump thrust!

dirty gas pump 

starting off with simple tea-bagging, making sure that her nose is between your ass cheeks, and as she is jacking you off, you fart as much as possible.
I know she wants a dirty gas pump when she insists on paying at the local mexican restaraunt.
dirty gas pump by Maxx Casey October 2, 2006

Gas Pump Roulette 

While pumping gas, you try to release the pump trigger at the number you want it to land on in one try. The less risky people release a few cents underneath the target number then pump the trigger until it gets to the number. It is kind of reverse of russian roulette.
Pumping gas this morning, I tried to land on 30 dollars exactly but hit $30.05 instead. I lost gas pump roulette today.
Gas Pump Roulette by Brandon2k9 October 16, 2012