stands for Nasty Little Bang Bang. It is used to describe good looking females that you encounter throughout the day. Usually the female is a college student and will be wearing skin tight apparel or very little clothing at all and are typically stuck up. When there are more than one of them then they are called NLBB's.
I saw some NLBB's leaving the fish market earlier today, they were quite attractive.
by muscle/milk April 28, 2011