A term first coined by Dr Gregory House in season 6 episode 13 to denote the feigning of a practical joke on oneself to avert suspicion from other people about one's guilt as a prankster.
Wilson:You created empirical proof that I didn't prank you selling me on the notion that you didn't prank. Maybe you self-pranked.
House: I don't masturprank
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Pulling a prank on your future self.
I indulge myself in masturpranking to keep myself on my toes