Top Definition
the sudden, unexpected boner you get for no apparent reason. can be brought on due to no stimulation of the penis, just no reason.can be abbreviated as NRB.
Fred:so, I was sitting in the class the other day and I asked the teacher if I could go to the bathroom and I got up and had a no reason boner!
Rick: That shit's funny dawg, did the teacher see you?
Fred:Yah!, along with the whole classroom too!, I was embarassed!
by Ya Boy Trax July 04, 2010

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