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1.
(transitive verb) To obscenely expose one's testicle or scrotum to another, either by pulling up one's shorts or by other means. A nut-flash is typically meant to frustrate or surprise the victim.

(noun) The action of nut-flashing.
Spencer: (To Lauren, aggravated) Laurrennn! Cooper nut-flashed me!

Cooper: No I didn't! I was only itching myself!
by Mezzo7 September 02, 2012