The cheap, thin crust, high-cholesterol frozen pizzas readily available at white trash grocery stores such as Aldi. Despite the name, they are delicious. White trash pizza in its truest form has no toppings - it's just crust, sauce, cheese, and probably a few chemicals you don't want to hear about.
Guy: I'm gonna throw a white trash pizza in the oven. Want to split it?
Dude: Hell yeah.