It’s been around for a while now. It really refers to people born with both sexual organs. I think it also applies to people with CAIS - Complete Androgen Insensitivity Syndrome.
Some people suspect Jamie Lee Curtis has CAIS. This lady who appeared on Oprah is actually genetically male: https://www.youtube.com/watch?v=cJxZe4KAdqU
I don't know who those "some people" are, but I saw her in the movie True Lies the other evening and there is no question in my mind that she is female!