look up any word, like blumpkin:
For No Reason Boner. When you randomly get a boner for no reason, mostly in class or a meeting.
"Man I got the biggest FNRB today in class, it was AWESOME!"


Since I have a FNRB, will you give me an OTPHJ?
by wowihavethebiggestFNRBrightnow April 13, 2011

Words related to F.N.R.B.

boner cock dick erection hard penis viagra
For No Reason Boner

Used often when one wants to discreetly express the fact that he is currently experiencing a boner for no apparent reason at all.
Dude 1: They just called your name... go get that diploma.

Dude 2: Shit. I don't know what to do. I've got a F.N.R.B.!

Dude 1: Ouch. Bad timing
by Worldwide Thugs September 13, 2006