Well there is the medically complicated boring definition and then there is the quick definition. I'll give you the latter.

It mean's I'm an 'effeminate' gay guy who use do date men but now I've essentially turned lesbian. I am only attracted to women for the last 10 years. Men repulse me. Though I don't like straight women, I like lesbians, which makes it really difficult to find someone to get in a lesbian relation with.

But that's basically it.