an internal source of extreme amounts of energy used during times of physical exertion such as sex or rowing
Idiot: Barney, it looks like you are getting a little round around the middle *poke*.
Barney: No, you idiot, that is my fuel tank. It is how I pwn you so hard when it comes to fucking hot girls and on the water!

The Fuel Tank 4 is ultra fast, steamrolling past the competition.
by Fuel Tank 4 April 19, 2006
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After having anal sex and ejaculating, the male keeps his penis inside the female's rectum until it gets flacid, then he proceeds to fill the ass with urine.
She said, "Fill me up!" so I fuel-tanked the bitch.

Since it's hard to pee when your dick's hard, you'll have to give it a moment to soften up before a good fuel-tanking session can take place.
by Robert Arthur Gilbert December 5, 2007
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When a person has a fat belly, they've installed a Long Range Fuel Tank.
Mate 2 "Hi, I haven't seen you for years" "Looks like you've put a bit on in the front" "Looks like a pot belly"

Mate 1 "Nar" It's what I call, a Long Range Fuel Tank" "It cost me a fortune, an' all" "It took a lot of time & effort to install"

Mate 2 "Yeh" "It looks like it, when I get to your age I'll probably have one installed as well"
by Bobwin February 11, 2012
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A after sex act in ware a individual pees in his lovers ass
A: Are you ready for round 2? B :Yes A: DID YOU JUST FUEL MY TANK????

Fueling the tank
by lil_pvc May 25, 2020
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To be hungry
To eat something
food= fuel and
the tank= your stomach
"I need to get some fuel in the tank man"
"I think someone has a little to much fuel in their tank"
by <3 girl February 22, 2009
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