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When someone is sleeping and they have a dream or thought of themselves getting hurt or falling, and their body physically reacts, and causes them to jerk or flinch rather spasmodically.
Guy: What the fuck tracy, you kicked me in the balls last night in bed???

Tracy: sorry, i had a bad dream and probably got a nocturnal flinching.

Guy: go fuck yourself, we're done.
by yuriogy1 December 05, 2009
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