"Pizzadude" is the most common name for the pizza delivery guy, who indeed usually does have a peice of crap car. Can also mean, although used less commonly, the entire pizza place itself.
Pizza delivery person, usually seen driving a hoopty. From the '80's Tom Hanks movie "The 'Burbs", where Corey Feldman implores his friends not to leave, it is worthwhile to hang around, because the PizzaDude is coming.
"Get ready to answer the door, I hear the PizzaDude's hoopty coming up the block."