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Combination of the the word incest (sexual relations with a family member) and the French phrase c'est la vie, which means "That's life" or "Such is life."

Used as a retort to somebody that chides one for getting it on with blood relations.
Person One: You mean you had sex with your own mother? How could this happen in today's world?!?

Person Two: Inc'est la vie!
by Squeege K. August 11, 2010
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