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1.
To have sex with your clone.
I engaged in some hot incesturbation last night!
by livejamie June 07, 2004
 
2.
Jerking off or masterbating while thinking about one of your family members
I had a two hour incesturbation session last night thinking about my moms hairy muff

by doing mom September 26, 2006
 
3.
The act of having sex with your clone.
"Gosh, mom! Knock before you just barge in! I was incesturbating!!!"
"Oh Lord! When did incesturbation enter this home!?!"
by Korgul December 02, 2009