ass pumping - utilization of the buttocks in a general up and down motion to facilitate the use of a pump or other similar applied pressure working device. Definition may be inclusive of fully or partially clothed buttocks, or entirely unclothed buttocks.
Common devices used when ass pumping:
tire pump, beer keg "tap"

Expressions: "You can pump a keg with that ass!"
by TCR May 15, 2006
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wen u grab a fuckin turkey baster and blast air into ur anus, then lol u fart out the ait on vent like a dik sleeb. ovarie ovvare aovaoadoaha nai aisiahnai hniasnia nisai nanansi ni aia inin ia iani in in in sin inindaidn ianiin n ia inain ins in.

hey shooji mike and kyle,, i got something 4 u, BLAST, who dud how u did dat, a ass pump turkey baster in my ass makes air reflect onto yo dome, u pussy bitch.
by jasoman August 31, 2006
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The act of melting down a Madden CD and placing it into a syringe then injecting the hot liquid into one's ass like a steroid injection.
Adam melted Madden for Eric because the game was so garbage. Then Eric bent over and got an injection of Madden. This is Madden Ass Pumping.
by AFNLD December 15, 2010
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When a dude sticks his long, hard, throbing cock in a womans ass then pulls out and pee's in her mouth.
Hey man, what did you do last night?

I gave this chick a dirty ass pump; it was awesome.
by CoolBreeze420 September 1, 2008
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Person 1: Hey, did you hear what Jason did the other day?
Person 2: No, what'd he do?
Person 1: He was totally pumping ass with Becky.
Person 2 : Goals.
by lolingatyouandyourlife June 15, 2015
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A term coined by Static Noise Podcast member Matt Chinander. It means the same thing as kick ass. Another variation is "Thrust Butt", coined by fellow podcast member Alex.
Andres: What do you think of Let Yourself Go?
Matt: Very pump ass.
by THRUSTDABUTT July 31, 2012
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