Fuel Tank 

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.

Fuel Tank by Fuel Tank 4 May 1, 2006

fuel-tank 

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.

fuel-tank by Robert Arthur Gilbert December 31, 2007

Long Range Fuel Tank 

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"

Long Range Fuel Tank by Bobwin April 4, 2012

THIS AIN'T NO BEER BELLY; THIS IS A FUEL TANK FOR A WHOOP-ASS MACHINE THAT'S ABOUT READY TO OPEN UP A CAN ON YOUR ASS! 

what you say to somebody who makes fun of your gut, or says you've got quite the beer belly.

THIS AIN'T NO BEER BELLY; THIS IS A FUEL TANK FOR A WHOOP-ASS MACHINE THAT'S ABOUT READY TO OPEN UP A CAN ON YOUR ASS! by weave September 7, 2003