Top Definition
When, in cases of extreme thirst, a person using a soft-drink fountain fills the beverage container, chugs it, and then fills it again before sitting down to eat.
Person 1: Hey man, why did it take you so long to get a soda?

Person 2: I was prefilling my cup; I've been thirsty all day.
by Matt Coon August 07, 2007
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