An augmentation of Bint - English slang for a whore or bitch, perhaps similar to a tart. It has become the favoured sexist slang in many circles. The meaning remains largely unchanged however dozy is added probably just because it has a better ring to it.
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.