Filling The Gas Tank

Filling the gas tank is when you stick your dick into someone's ass (male or female) and proceed to piss.

Cade: I got laid last night.
Owen: Yeah right, by who?
Cade: Bronwynn let me try Filling the gas tank
Owen: 🅱oi

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Fill the gas tank

To urinate in a sexual partner's anus.

Person A: I went home with that girl last night.

Person B: Did you "fill the gas tank"?

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