1 definition by David Letterman 69

Top Definition
You know, when a bunch of people that look kinda the same have sex with some other person. If they're siblings, it is not doppelgangbanging, it is incest.
Alec Baldwin, Tom Hanks, Mel Gibson, Richard Gere, and Al Pacino are all having doppelgangbang with that one girl.
by David Letterman 69 December 05, 2008
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