Genderqueer is an identity for people whose sense of gender sits outside the man/woman binary — blending it, refusing it, or moving between.
Genderqueer got here before "nonbinary" did. It's a person telling you their gender doesn't fit the two boxes on the form — and that the misfit is the point, not a problem to be solved. Some genderqueer people blend masculine and feminine, some sit outside both, some treat gender as a dial they turn depending on the day. There's no single look, no required surgery, no dress code. The one rule is that they define it, not you.
The word carries a charge that "nonbinary" doesn't. "Queer" was a slur before the community picked it up and wore it on purpose, so genderqueer reads as more political, more in-your-face — which fits, because that's literally the newsletter it came from. Plenty of people use genderqueer and nonbinary interchangeably; others pick genderqueer precisely because it keeps the edge, the history, the refusal to be made palatable. Both readings are correct. Ask which one someone means before you assume.
On a dancefloor this is refreshingly simple in practice. You don't need to decode anyone's gender to share a space, a look, or a night with them. Use the name and pronouns they give you, drop the reflex to sort strangers into "sir" or "miss," and move on. Genderqueer isn't a puzzle for you to finish — it's someone who already did the work of figuring themselves out, and is letting you in on the answer.