For historical purposes, Friend of Dorothy refers to Judy Garland and the Wizard of Oz! Not only was Judy Garland a gay icon, but the movie is magical and has references to another world, one in which we different boys and girls might fit nicely into. It speaks to a part of our history and our coming around and out.
Gay history is extremely interesting. Diana Gabaldon has written some nice fiction about Lord John, a gay character in the 1740-1770s, with all the accompaning lingo of their day. "Miss Thing" has been around a very long time!