When a female/male kneels behind a male while he is standing and has an erection. The kneeling person reaches between his legs and grabs his erection like a microphone, pulling it down, then sticking their thumb up his ass with the same hand. Then they squeeze their hand tight, not unlike that of a gas pump handle.
"Last night she gave me the Gas Pump so much I think Exxon made money."
by Chaindive August 4, 2007
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When you stick a henny bottle in a girls butthole, and let the Hennessey flow through the body.
"Yall ever gas pump a bitch?" -Smokepurpp
by lil6ix April 12, 2018
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The act of urinating in a female orifice while achieving maximum penetration. Please do not smoke cigarettes or use your cell phone during this activity. It is not a hazard to your health but it is just rude.
I was so drunk,I couldn't tell if I came or gave her a gas pump.
by fivecocksatwilcox July 4, 2005
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A person who needs to have his/her gas PumPed; Someone from Dunmore, PA; An L7
That fucker is such a gas PumP....
by Hip March 29, 2003
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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.
by krautmonkey December 19, 2013
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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.
by awesomesaus December 20, 2012
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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!
by brandon2k9 April 21, 2011
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