N.R.B. 

No Reason Boner, getting an erectefied penis for no specific reason.

"dude, yesterday in math class I got a huge N.R.B. out of nowhere.

N.R.B. by Lorenzo October 12, 2004

N.R.B. 

No reason Boner. A hard on achieved with no apparent explanation.

I got a N.R.B. this morning at church.
I got a N.R.B. right in the middle of Schindler's List.

N.R.B. by B.O.B. April 4, 2003

N.R.B. 

Acronym for No Reason Boner. A random boner a guy gets for no apparent reason.

Zach; Did you see Evan got an N.R.B. in school today when he was akes to solve the problem on the board.

Ray; Yeah. How embarassing.

N.R.B. by John Dennis Riley February 6, 2008

N.R.B. 

No Reason Boner:
A spontaneous erection without any mental or physical stimulation.

"Dude, just as I answered the door I was hit by the N.R.B.!" "Woah that must bave been awkward bro dude man"

N.R.B. by SnazzLem January 22, 2013

N.R.B. 

Pronounced:(nerb) Its an acronym for no reason boner.

Guy 1: Why arent you getting up?
Guy2: I have a N.R.B.

N.R.B. by ImBeatenFrequently May 10, 2018

n r b 

No Reason Boner; an erection that pops up outta nowhere.
spoken as: en are bee, or nerb.

"Yeah man, the cop wanted me to get outta the car, but i had an N R B so i just took the heat."
"We broke up (other dude: "why man?"), got a fucking N R B at her grammas funeral."
"If i dont stop gettin nerbs i gonna cut the fucking thing off!!"

n r b by 6IXTY 1NE July 25, 2006

n.r.b 

1.no reason boner
2.unexplainable boner

dude i got an n.r.b. in science.

n.r.b by joe mackdonald April 22, 2006