It's used a lot to describe programming in health care focused on the LGBTQ community. So where I am, there is a community center, and a community health clinic with lots of programming, such as health clinics, support groups, leisure activities. It is also a way for people to self identify. It is more broad than simply gay, and encompasses a broader range of experiences. This is a term created by members of the community, and without the stigma attached to some other labels. That's how I've seen it used, but there may be other uses also.