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A form of male masturbation where you cross your arms and use the back of your hands to hold your penis.

The hairier your hands are, the closer the experience will be to a 1970s vagina.
Todd: Oh shit, sorry man. Wait, what are you doing?
Stan: It's called the Backwards Sandwich, dude!
Todd: Huh. I uh, think I'm going to make a sandwich for myself.
by Henry J. Pinkerton, PhD January 09, 2012
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