look up any word, like fluffer:

1 definition by Some fag with no balls

 
1.
NRB
NRB stands for No Reason Boner. Obviously, it's a boner you get for no apparent reason. It can happen at any moment in time.
I was walking to the front of the classroom when ... SHIT! I got an NRB
by Some fag with no balls June 25, 2009