When the hair on your balls get all twisted up and knotted and it starts to pull on yourscrotum in a such a manner as to cause discomfort.
Often requires rather obvious pulling of the pants in the testicle area in an attempt to untangle the ball-hair.
Joe:Yo dude, why yo all walking all sketchy and shit?

Bill:Shit man, I got some serious nut knots goin' on, it like my balls be all bein' pulled on and shit.
by Kronen V May 7, 2010
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A hairstyle similar to the top knot or man bun but the guys ball sack has an undercut with part of the pubes tied in a knot.

Can also be worn as a Mercan Nut Knot with artificial pubes.
Adam where did you get your Nut Knot done, it's a real fashion statement.

Careful taking a squat you Nut Knot is dangling on the ground.

Adam your alopecia makes your sack look like a bald Danny DeVito you should get a Mercan Nut Knot to jazz it up
by EvLovesGoldenRivets June 2, 2021
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