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n. 1. The act of two cells con-joining rather than breaking apart.

2. When you manage to have sex with yourself. An extreme form of masturbation.
I suffer from internal incest. My doctor said that I'm so white trash that even my cells have sex with their sisters.

Jimmy is a product of internal incest, which would explain that third ankle.
by qwertypod February 03, 2004

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