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1.
Same-dating occurs when the two individuals in a couple each have dated an ex-girlfriend/ex-boyfriend who are now currently dating each other. When this occurs, each member (of the two couples) has same-dated every other member in the group.
Guy: "Hi honey, did you hear that my ex-girlfriend, Stacy is dating your ex-boyfriend Kevin?"

Girl: "Ewwww! I can't believe I same-dated Stacy!"

Guy: "Yeah, and now I'm eskimo brothers with Kevin!"
by MaxmumPimp August 12, 2011