Top Definition
If a stranger looks identical to one of your friends from behind, then the stranger and your friend are back twins.
Guy 1: Hey Ben, what's up?

Guy 2: (turns around) Huh? I'm not Ben.

Guy 1: Oh, sorry, you're just Ben's back twin.
#twin #doppleganger #look-a-like #mistaken identity #seinfeld
by Woodson April 10, 2007
5 Words related to back twin
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