A group of girls, usually preps between 13 and 21, who think they are inherently better than everyone else and as such have the right to make other girls feel inferior.
Girl 1: Did you hear what Jessica and her friends said about Kate?
Girl 2: Ignore them, they are just a pretty-girl hate machine.
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. Usually meaning that the person is out of touch with reality.
The new guy seems pretty happy for a dude who has no job, no money and no family. He must be on a pink cloud.