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The metaphorical container that holds all the liberties in a friendship. Occasionally needs refilling to keep the friendship in a proper give-take equilibrium. Can be refilled by one friend giving the other friend food, alcohol, sexual favors, money, rides, or even filling their actual gas tank.
Molly: "Mike, can you drive me around to do some errands today?"

Mike: "It's been a while since you filled up the friendship gas tank..."

Molly: "What if I buy you Taco Bell?"

Mike: "Deal"
by Mike the LCB March 20, 2012
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