Whopper is a kind of hamburger sold at the fast-food chain Burger King. It is made using a beef patty, lettuce, tomato, sliced onion, pickles, ketchup, and mayonnaise served on a sesame seed bun. Also, cheese can be added at the customer's request. There is a Double Whopper also available.
A Whopper Jr. is the same as the Whopper, but smaller.