2 for flinching - A game where where you make someone flinch and if they do you get to punch them twice, however if you make contact while trying to make them flinch they get to punch you four times.
(makes them flinch) dats 2 for flinching man (proceeds to punch them twice)
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.