NBR 

Not Blood Related; Often used to justify a brother-sister relationship. Frequently used in discussion about anime because every anime is actually about hot brother-sister loving.

It's okay, dude - she's NBR so its totally cool.

NBR by CordycepsNG September 20, 2015

NBR 

No Beers Required. Good looking girls that don't need any consumption of alcohol to make them look better. The converse of a Five-Pinter.

That girl is HOT! A definite NBR!

NBR by brooskitooski May 20, 2008

NBR 

An acronym for “No...but really”

Used to inform someone how serious you are about a previously made statement.

Sam Russell: Everyone loves me
Silly person: No that’s not true
Sam Russell: NBR!

NBR by SamuerRusserr December 7, 2010

NBR 

To receive sexual stimulation by way of handjob

"The may-issue crap is basically no CCW unless you know the sheriff and are NBR'ing him.

NBR by Trlsmn July 24, 2009

NBR 

Not Business Related

I am an employee, and I send an email to my colleagues about sport, so I mark it "NBR" to show it's a non business related email.

NBR by otaview December 7, 2010

NBR 

Nipple to Boob Ratio

Damnnn...that Kiki has some nice NBR

NBR by Stevie B for MVP June 27, 2012

NBR 

Nipple to Boob Ratio

Ben: That girls NBR is nasty. Too much nipple not enough boob.. If the nipple's too small it feels like you're playing with a guys nipple and it's just not right either.

A healthy NBR is considered approximately 1 part nipple for every 6 parts boob.

NBR by NippletoBenRatio August 30, 2013