A seductive, intelligent, witty and
classy female assassin who goes predominantly against male targets who are lured into following her because she acts like a cock
tease, but quickly
meet their deaths when they least suspect it.
The term has become slightly overused/extended to include any woman who shows even the slightest hint of being femme fatale, or wearing black leather, to describe herself.
That
femme fatale I used to call my girllfriend. stuck a
gun in my nuts and threatened to give me a .44 calibre
vasectomy. So I bitch slapped her.