Top Definition
The condition where seeing a pornographic image either in person or on a screen causes the markileptic to instantly fall asleep.
"Damn dude, I walked in on my roommate, and he was passed out at his computer with his dick out while while a youporn video was playing."

"Wow, your roommate must be have Markilepsy."
by delathedeligator88 May 14, 2009

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