Short for "No Reason Boner." Generally, an erection that has no inherent cause other than a young man's hormones going crazy. The term is usually used to clear sexual tension when other prepubescent boys notice a bulge originating in your crotch area.
"For Christ's sake Dave."
"heh heh...::nervous laughter:: talk about a NRB. I sure hope the 10th graders don't see me."
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