1 definition by RashadMcCants

Top Definition
This term describes a situation in which a male, generally younger, recieves an excitation of the genitals due to no discernable circumstance. e.g. in class before an oral presentation or standing up on a public bus.
"I hope this No Purpose Boner (NPB) goes down before my chemistry presentation" - yin
by RashadMcCants January 04, 2006
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