vocative "bitch"

[Joanne M. Despres]

> I have been told that this practice is found in US biker gangs, and
> internationally in-group between homosexuals, both male and female.

I've never heard the word used among gay women of my
acquaintance, or used it myself, in the way you describe.  Perhaps
my cohorts are a bit old-fashioned, but I think most of them would
find the vocative use of "bitch" highly offensive.

Joanne Despres
Merriam-Webster