Eyesdropping is essentially eavesdropping with your eyes. When someone looks at something that is not theirs. The thing that the person is looking at does not necessarily have to be confidential but it just has to not be theirs like a computer screen or a cell phone.
"Raymond, stop eyesdropping, look at your own computer screen."
"Liz, don't you have better things to do than to eyesdrop?"
12 step recovery jargon referring to someone new who talks about how great life is, now that they're sober. 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.