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1.
When you have sex with your clone, your doppelganger, or a version of you from a parallel universe.
If you clone yourself and then have sex with the clone, it is neither incest nor masturbation, but both: incesterbation.
by Anon Imus November 15, 2006
 
2.
The act of having sex with your clone; a mix of masturbation and incest.
Spotti cloned herself and I caught her incesterbating, and it was awesome. It was some pretty hot incesterbation.
by Taliaa June 18, 2007