From when after filling up your vehicle's gas tank, it is above the Full line. In a sense holding more gas than physically possible.
David: ROAD TRIP TO BERKELEY FOR SOME CINNAMON ROLLS!!!

Matt: Why are you yelling?

David: Cuz we gots free gas. So it's free.

or

Maddie: Do you have any free gas so we can we go on an adventure Gab-riella?

Gabby: Absolutely Madeline Rose.... should we invite Paige?

Maddie & Gabby: Nawwww.
by Junko915 February 7, 2011
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From when after filling up your vehicle's gas tank, the needle lies above the Full line. In a sense holding more gas than physically possible.
David: ROAD TRIP TO BERKELEY FOR SOME CINNAMON ROLLS!!!

Matt: Why are you yelling?

David: Cuz we gots free gas. So it's free.

or

Maddie: Do you have any free gas so we can we go on an adventure Gab-riella?

Gabby: Absolutely Madeline Rose.... should we invite Paige?

Maddie & Gabby: Nawwww.
by Junko915 February 11, 2011
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Nothing is better than getting a free tank of gas. It is one of the best experiences one can have aside from a threesome, which in turn could be described by the phrase. It may also be used to describe the greatness of a person, place, or thing.
That party was a free tank of gas!

That girl's body is a free tank of gas but her face was diesal.
by Turd Ferguson. July 2, 2008
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