Pre-pizza

The pizza that you eat just before eating another pizza (after which you may endulge in a post-pizza)

Example #1
Lucas:"What should we eat tonight?"
Malt: "How about pizza?"
Lucas:"That's cool. Let's go grab a pre-pizza first, though"

Example #2
Malt: "I'm doing cocaine. Wanna bump?"
Oliver: "No. i'll just go get a pre-pizza"