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The act of quickly falling asleep, and/or the feeling of fatigue that one feels after engaging in a satisfying act of sexual intercourse with a partner.

Derived from the words "narcolepsy" and "sex".
Sally laid awake for hours, but after waking up her boyfriend and having sex with him, she fell asleep within five minutes. It was a classic case of narcosexy.
by lillyrilly July 10, 2013
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