-interjection
1. (used to express a greeting, answer a telephone, or attract attention.)
2. (an exclamation of surprise, wonder, elation, etc.)
3. (used as a strong expression of joy, pleasure, or approval.)
Also: Yoata.
–verb tr (used with object)
4. to give an affirmative reply to; give assent or approval to.
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.