:''This article is about the
candy bar; for twin level transportation vehicles see
double decker.''
A
Double Decker is a candy bar made by
Cadbury, introduced in 1976. It consists of a two layer bar covered in milk chocolate. The lower (crunchy) layer is made of crisped cereals, and the upper (chewy) layer of
nougatine. The whole is flavoured with a small amount of
coffee.
A "Double Decker", in the American party scene, can also refer to having a bowel movement into the top tank on a toilet. This often proves quite humorous for the host or hostess, who normally do not realize the act has taken place until the following morning.