What is the meaning of Double-decker?

A vehicle (usually a bus, coach or train) or aircraft with two floors.

A frigate with two decks above the waterline.

Any object with two layers or parts stacked on top of each other.

  1. A sandwich with three slices of bread, whose toppings are on both sides of the middle slice.

A sandwich with three slices of bread, whose toppings are on both sides of the middle slice.

A headline that is two lines long.

a man who both penetrates (top) and is penetrated (bottom) in sex with other men; sometimes also has relationships with women and/or presents masculine as well as feminine mannerisms and appearances.

Source: wiktionary.org