Top Definition
The process of topping off your gas tank and trying to get an even number on the price or gallons - or a specific #.
I was at the Exxon station putting gas in my car this morning and continued to 'top it off' until I had exactly 20 gallons of gas. I have a terrible case of Exxonumeration.
by CaveCreekGirl March 03, 2009

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