1 definition by RICH TEEJ

Top Definition
When both members of a married couple are simultaneously in a relationship with the same third party.
Girl: Can Scarlett Johansson be our Mutual Extramarital Relationship?
Guy: What?
Girl: You know, we both get to bang her if we get the chance.
#affair #threesome #marriage #sex #relationships
by RICH TEEJ October 05, 2011
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