For instance, a lot of this conversation has revolved around men explaining why they think a policy against harassment at conferences is a bad thing. We don't have a lot of women participating in this discussion, but I suspect that if they did, they'd garner plenty of responses saying "Clearly you don't understand this issue as well as I[, a man,] do." And I suspect that because when topics like this on HN do get responses from posters that go "I'm a woman and I think this is helpful," they inevitably receive that exact kind of response.
I've been told, by some of my close ladyfriends, that this behavior is enormously frustrating, and that most of them recognize it as a thing which is almost always what a guy does to a woman, rather than a guy to a guy or a woman to a man. I see enough of that behavior to agree with them that yes, the term has a legitimate use (though it doesn't preclude people of either gender from being more generally irritating, of course).
I've seen situations where some woman apparently interpreted this as, "any time a man explains something unprompted." As far as I know, Dunning-Kruger isn't skewed by gender.
I thought you were talking about the general phenomena of people who know almost nothing about a subject thinking they know almost everything.