Queer people. This is an easily-inferred reference for anyone who's decently-good friends with at least one gay guy or lesbian.
And I'm a little concerned why not knowing about something that seems like an esoteric piece of fetish-related in-group communication implies that I don't hang out with queer people? Is there an expectation that in order to hang out with people belonging to some group, I need to learn specific lingo regarding that group's sexual power dynamics?