Best definition
Short for “No Reason Boner.” Generally, an erection that has no inherent cause other than a young man’s hormones going crazy. The term is usually used to clear sexual tension when other prepubescent boys notice a bulge originating in your crotch area.
“For Christ’s sake Dave.”

“heh heh…::nervous laughter:: talk about a NRB. I sure hope the 10th graders don’t see me.”

NRB: define #2
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!!”
NRB: define #3
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.
NRB: define #4
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.
NRB: define #5
Noun. NRB ( No Reason Boner)

This is what all male humans experience spontaneously, occuring from the early ages of adolesence to even in some rare cases senilty. NRB can attack men unkowningly, silently, and suddenly causing possible embarassing situations or even discomfort.
Zach was wearing basketball shorts walking to third period when he suddenly got an NRB and caused laughter and jeering from students around him.
NRB: define #6
No Reason Boner
I was sitting in class when I got a huge NRB.
NRB: define #7
n.r.b reason boner

2.unexplainable boner
dude i got an n.r.b. in science.
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