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When you are about to bust, run as fast as you can to the toilet and nut in it.
Person1: Hey, what’s this on your wall?
Person2: Oh, that’s when I failed my nut run.
by hot man ass September 21, 2017
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1.A person who is useless
2.A drip of sweat that starts at the underside of your nuts where your ass crack starts and runs down your nuts getting your underpants wet.
Damn it is so hot I already experienced nut run.
by Eli March 04, 2004
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