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to move your hips up and down in a humping motion so that your scrotum swings up and down giving the appearance of your "nuts flapping".
I saw robert in the hall today doing the nut flap.
by Alden aka Ginger April 14, 2006
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The leftover skin of the scrotum after a man gets his testicles removed, so the "flap" of skin from the "nut"sack.
"So how did Jim's surgery go?"
"They couldn't save his balls because of the impact of all those fish, so they had to settle with the nutflap."
by ReaCtioNz December 23, 2014
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