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The act of double penetration of the vagina and anus wherein both penises move out of sync (one goes in, one goes out) while never completely withdrawing from their respective fuck holes, creating the illusion that they are attatched in the middle and looking like a peice if thick dental floss going back and forth inside the recipient's abdomen.
Brandy: So I took these two guys home last night, they were cock flossing me all night!
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