MRH - the tactic I took before I started socially transitioning was to go to these things presenting as fairly unambiguously tomboyish-female (thus avoiding the ambiguity awkwardness) and simply assert myself as one of the guys anyway. That's a model of female behaviour that most guys under 30 or so are accustomed to and know how to deal with. It's a good way to get the girls to hate you, but in my experience they don't like me terribly much either way.
There are very few things you have to censor when you do that. STPs might be one of them, at least if the girls are around (if it's just the guys, they'll think you're cool). You can get away with just about anything else by prefacing it with "If I were a guy...", like "If I were a guy I'd grow a Fu Manchu." And for anything not having to do with your genitalia, your beard, or your body hair, you can just speak your mind.