A fancy term in the field of fluid mechanics that really just describes the boundary layer momentum thickness. No one really knows what it is, what it does, or how to use it - not even the teacher.
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.