Since Tyra Banks' bastardized inception of the term into everyday housewife banter; gays have since denounced it. The only people that use it are middle school wannabees, straight women who think they're "down" and poser fashionista's. Anything that is to be considered "fierce" is pretty much mainstream to us gays.
Amy: "So what do you think of these Louboutin's?"
Sara: "OMFG, they are like, soooo fierce! They make your calves look totally skinny!"