(Noun) Term coined in Houston Texas at the winter weekend BBQ. When about to engage in coitus with a Thai lady boy you reach down and slowly slide your finger into an inside out urethra. You then wipe your hands on a dirty rag
“Hey Greg, how hot was that Thai chick?”
“Man, that wasn’t a chick. I just got a sweaty gas tank”
by DDC ATL November 11, 2017
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Something one does to get elected captain of a high school cross country team. The act is very naughty and obscene. The person who puts it in the gas tank usually denies the allegation or asks what it "puts it in the gas tank" even means.
Flynners puts it in the gas tank, so does his running friend N.O.
by Pen Bennington February 16, 2010
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Person A: I went home with that girl last night.

Person B: Did you "fill the gas tank"?
by tabittle August 6, 2009
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A penis the size of a hugeee gas tank

also called just "GTP"
Joe: H000LY SH111T!!one1!! this porn is like soo good!
Dan: L0L. dat nigga has that GTP. all day, for life.
Desmond: GTP?!?
Dan + Joe: GAS TANK PENIS
by Bethekingdom April 5, 2011
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After eating a bean burrito and while performing the Dirty Gas Pump, let your anus explode a steaming load on the persons face.
Last night I gave Erica the Exploding Gas Tank
by BreSki January 17, 2008
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When you cum in someone’s asshole.
“How’d it go with that girl last night?”
“It was great man, she let me pour sugar in the gas tank and everything!”
by Zashak January 1, 2020
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Ejaculating or inserting seminal fluid into the partner's anal cavity
"Yo bro I hooked up with this chick last night. She's like Ferrari sexy with the ass of a lambo so I had to put a little sugar in the gas tank."
by JRSlay July 27, 2017
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