1 definition by ATownMerk727
acronym for navy blue buddy. it is a very intimate relationship that arises from two companions who happen to notice one day that they both have a wardrobe that is composed with a majority of navy blue clothes. this bond is never broken. once a nbb, always a nbb.
Oh my god! I'm wearing a navy blue sweatshirt and you're wearing a navy blue shirt!!! I guess you could say we're nbb's!!
by ATownMerk727 October 21, 2010