When a person displays that they are better than their friends, or treats their friends indifferently, especially where there has been a relationship of good standing previously; hence the term 'new'. i.e. without any history with you.
Why Jamie acting brand new like he don't know nobody? Just be cause he got a car don't mean shit, we practically grew up in the same house and yesterday he said he couldn't come over my house because it has a garage. I was like, well what about all those other 1000's of times.
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.