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. 

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 

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

N.R.B 

N.R.B is an abbreviation for what is known as a "No Reason Boner".A No Reason Boner is when a male randomly "gets hard" for no apparent reason.Also see boner.

Man I have a wicked N.R.B right now.

N.R.B by rundmc March 2, 2006

N.R.B 

An Acronym for No Reason Boner

I had a major N.R.B in Geometry.

N.R.B by CJ McMastaKewlio February 9, 2009

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