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When two penises are filling a woman at the same time. Can be any combination of holes - one penis at each end, or both in the same hole.
I can't believe Jeremy and your dad gave your mom a double piping this morning! Does she have my #?

Christine was super enthusiastic for the two-for-one deal until she realized it was just an old-fashioned double piping.
by A Man123 March 19, 2014
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