The act of urinating inside of a vagina or anus during intercourse, similar to pumping gas or fuel into a vehicle, Jerry can or other gas/fuel storage device.
"Bro, this chick I picked up last night was hella freaky. She couldn't get off until we started fuel pumping."
"I'd love to give him a real good fuel pumping, if you know what I mean."
Urinating in a sexual partner's rectum.
Jim: So, did you pee in her butthole?
Matt: Absolutely, I fuel pumped the shit outta her.
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The act of somebody defecating into another person's asshole and after 2 days, they trade. This repeats until a person cannot fit any more in their asshole.
Person 1: Hey, want to play Faulty Fuel Pump?
Person 2: Sure, be prepared to clean up, things are going to get messy.
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The dirtiest most anal satisfying sex position ever invented. Pioneered in Gunnedah, once you've been fuel pumped you will never go back
I have her the afgan fuel pump