When you jerk off quickly and quietly in an inconvenient manner or place because you just got really horny.
Mom: You've been pooping for a long time!
Me: I'm almost done!
Me in my head: Ok, looks like I'm going to have to make this a Rush - nut!
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An instantaneous release of testosterone resulting from a feeling of extreme awesomeness or manliness.
Dude that breakdown just gave me the sickest nut rush! Lets go lift heavy objects and skin small cute animals!
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