The Rice University Neologisms Database

Usually, one who is attached to another by affection; a good friend. At times, used to refer to mean, despicable people. My friend used this word because it is now a very common word used among friends to refer to very close acquaintances. In addition, this word is a shibboleth among listeners of rap music, and most individuals who watch MTV or listen to pop music have heard of it. Thus, by calling me a biatch, he was basically calling me a good friend and showing that he was part of the “in group.”