An acronym for “No...but really” Used to inform someone how serious you are about a previously made statement.

Nitrilc Butadiene Rubber. Trade name: Buna-N. A moderate-service synthetic rubber (polymer) typically used as a seat or o-ring seal in valves because of its abrasion resistance, resistance to degradat [..]

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.

To receive sexual stimulation by way of handjob

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.

Not Business Related

Nipple to Boob Ratio

See: National Board of Review of Motion Pictures.

Nitrile Butadiene Rubber. A rubber with excellent resilience and chemical resistance. Preferred material for the manufacture of camera O-rings, usually black. NBR has only limited UV resistance, and so should be stored in the dark. The optimal lubricant for NBR is silicone grease. NEX

Nitrile Butadiene Rubber (NBR) is a heat-resistant synthetic rubber, particularly resistant to petroleum products (e.g. fuel, lubricating oil, petrol and petroleum). 

Near-bit reamer

NBR may refer to: In rail: New Brunswick Railway, a former Canadian railway company absorbed by the Canadian Pacific Railway North Bay Railway, a light-railway system for tourists in Scarborough, Nor [..]

See Nitrile-butadiene-rubber