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Named for it's creator, it is a hollowed out dildo made to slide over the shaft of the penis. This makes it possible to have anal sex with other men without feeling weird about it, essentially enabling the wearer to claim that he is not gay.
Guy 1: "I can't believe you were diddlin' some dude's dirtbox when I walked into the apartment last night."

Guy 2 (holding booty's thick 8): "Dude, I ain't gay."
by I dig chicks hey May 22, 2007