could be a male or female who is not to a persons liking. This is usually because the person is basically ugly (fat,spotty..)
This saying is usually used by chavs as it is slang
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.