A more British slang term to describe one who participates in anal sex with another male.
Coined by the British, to refer to someone who is engaging in gay anal sex, or just anal sex.
Cadbury, being a well known chocolate, is used to reference the obvious connotation with the anus and poop. Used in phrases such as they are strolling down Cadbury Avenue, or ending up in the Cadbury Cul de Sac, etc.
Noteworthy: Cadbury Canal Cruiser is used to describe a male seeking another for anal sex. Another slang term associated with the chocolate company, Cadbury.