When a person, generally female, has two penises inserted into her at the same time, in the same orifice.

This term derives from the well known English mode of transportation: the double-decker bus. Best said in a slight English accent - "The Double-dicker".
"Me and my mate, Johnny, last night, we had this loose chick and we gave her the ol' English bus."
by Stu-pid-as June 6, 2017
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