Someone who doesn't label themselves, especially in relation to political party, philosophy or religion, but could apply to other arenas where someone shuns a particular label. Of course the irony of being an antilabeltarian is that yet another label has been adopted.
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.