(No reason boner) This occurs when you get a hard on out of nowhere. You may be sitting in class or hanging with your friends and BAM you have a huge hardon out of nowhere, and then your friend call you gay and leave you. A good way to get rid of these is think about something gross, like your grandma butt ass naked.
John: Hey hows it going man?
Jake: I got a huge ass NRB in class and ot was so embarrasing
John: Haha sucks to be you
Jake: I got a huge ass NRB in class and ot was so embarrasing
John: Haha sucks to be you
by TMan69 April 27, 2017
Get the NRB mug.