1. I don't think I've ever noticed myself doing this, but maybe I do. I'll look out for it!
2. When I was at school (5-10) years ago, people used "gay" to mean "lame", but in an inoffensive way. For example, "Oh that song is so gay". To be fair, I have a few gay (homosexual) friends and none of them are or were offended by it.
I've never met an adult who used "gay" in any way other than to mean homosexual. I think it's more of a kids thing.
Favourites: Eve, Alice, Norah, Isla // George, Charlie, Arthur, Oscar