Basically is the abbreviation of "Naked Body Watcher", A person who likes to watch nudity in secret or in public....using any means such as wallpapers, blogs, videos, pictures...anything involving some naked people. NBW's also have a tendency to peek at peoples posteriors. Yes, NBW's are disgusting, but anyone around you can be an NBW. So beware
oh my god is your live wallpaper an undressed dancing lady? You are definitely an NBW!!