Used to describe a pregnant woman who is carrying two or more children that are each a different ethnicity, an example of a mixed bag would be a woman pregnant with a white, black, Hispanic and Asian baby at the same time
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.