A word that when spelled backwards, turns into a different yet valid english word. They always come in pairs, for obvious reasons. Similar to a palindrome, but with different words instead of the same.
12 step recovery jargon referring to someone new who talks about how great life is, now that they'resober. 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.