Gas in the tank 

Taking steriods to give you more motivation to work out.

Chad has some gas in the tank, I think he has been on roids.

Gas in the tank by Truthteller85 December 15, 2011

Sugar in the gas tank 

Having effeminate mannerisms or being a closeted homosexual.

Is he gay? Well, I think he has some sugar in the gas tank.

Sugar in the gas tank by beepbopboop2 May 19, 2021

Abbo in the gas tank 

The only logical explanation for cars that appear to use a large amount of petrol.

Driver: Fuck man, how does my car use so much petrol.
Passenger: Eh, must be an abbo in the gas tank.

Abbo in the gas tank by Bill August 8, 2004

Puts it in the gas tank 

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.

Puts it in the gas tank by Pen Bennington February 15, 2010

Sugar in the gas tank 

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!”

Sugar in the gas tank by Zashak December 31, 2019

Sugar In The Gas Tank 

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."

Sugar In The Gas Tank by JRSlay July 26, 2017