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Pizza that someone eats after it has been left out for several days (aged) and resembles 'Grandma' with it's funky odor, fuzzy surface, and rigid texture.
John: Dude, What's that smell!!
Mark: Oh, It's probably this slice of Grandmas Pizza I found.
John: And you're eating it? Good God, It's starting to grow things on it!
Mark: has character.
by JoshyJosh April 01, 2011
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