When one of the spouses gets a little too bored of their significant other, and their eyes start to wander.
Billy: "How could she DO this to me? How could she be with another man behind my back?!"

Jake: "But dude, don't you also have an Extramarital affair?"

Billy: "SHUT UP! That's not the point!"
by Xxxxxxxxfanboyxxxxxxxxxx June 10, 2020
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An affair in which a male or female spouse are cheating on the other spouse with their side hoe/nigga.
Man: I can't believe that she got caught in her extramarital affair!

Man: Well dude, she was always a bit of a thot.
by americanrain March 16, 2015
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