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1.
The "afterpizza" is what is left on the pizza tray after all the slices have been eaten. If it is really good pizza, there will be a fight for who gets to clean the bits stuck to the pan.

Akin to the term "afterbirth", which is the extra "stuff" that comes out after a baby is born.
The pizza was so delicious that even the "afterpizza" was eaten.
by ColoradoDale August 07, 2010