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.
by rundmc February 25, 2006
NRB
NRB. (no rae bang) karaoke in korean.
kim: "heyy wanna go to nrb later?"
park: "ok! lets sing super junior and dbsk ;D"
by madcowmoo July 20, 2009
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
Nrb
n. pronounced (nerb)
Acronym (No, Reason, Boner)
when you are sporting a wood and there aint a reason to be aroused.

(George) "Hey guys, dont look now, but I like so totaly got a Nrb right now"

(Guys) "dude, thats sick, we are in the locker room"
by Tookie November 02, 2005
nrb
no reason boner. when you get an erection for no logical reason.
a: why do you have your hands in your pockets when you could be playing catch with us?
b: nrb, man...nrb.
by phlipnrip November 29, 2009
1.no reason boner
2.unexplainable boner
dude i got an n.r.b. in science.
by joe mackdonald April 02, 2006
nrb
No reason Boner
dude I was just sittin around and i got a nrb
by willdo 69 March 25, 2010

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