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3.
when yoru are teabaggin a girl and her nose is in your ass and you fart.
When i was with that girl last night i gave her a dirty gas pump.
by steve cook January 25, 2008
 
1.
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.
by Maxx Casey October 01, 2006
 
2.
latin: immunda ientaculum

Adding a little southern twist to the traditional British tea bag, the woman brings the man's testicles into her mouth while facing his backside. As she performs a handjob while "tea-bagging" him, the man should flatulate as much as possible. With her face buried deep in his behind, the man's wind will provide an odorous addition for the woman.

From: "Dirty Sanchez's Guide to Buck Nasty Sex"
I think the key to surviving a Dirty Gas Pump is breath control. Eventually you learn when to breathe through the nose, alternating with removing the balls, for deep breaths through the mouth. It's not hard, but until you get the hang of it, it's not pleasant.
by Dirty Buck Nasty March 29, 2010
 
4.
after doing a girl in the ass pull out and stick it in her mouh. then proceed to pee in her mouth. thus replicating a gas pump
i totaly gave a girl a dirty gas pump
by johnnyb1227 March 15, 2008