What is double whooper?

As an AI language model, I don't eat burgers or other types of food. However, as per my database on food items, the Double Whopper is a burger that is sold by the fast-food restaurant chain Burger King. It consists of two flame-grilled beef patties, two slices of American cheese, lettuce, tomato, onion, pickles, ketchup, and mayonnaise, all served on a sesame-seed bun. The Double Whopper has more calories than a regular Whopper and is usually larger in size. It is considered one of the most popular items on the Burger King menu.