Chicago-style pizza is pizza prepared according to one of several styles developed in Chicago. It can refer to both the well-known deep-dish or stuffed pizzas and the lesser-known thin-crust "tavern-style" pizzas. From Wikipedia
A small poppyseed-crust pizza topped with hot dog slices plus seven Chicago-style condiments is now available at 21 Lou Malnati’s locations for a 30-day limited run.