A mood common among middle class teenagers, vibing is when you kick back, listen to some tunes (mainly slower rap and alt, but vaporwave, lo-fi, and others are becoming popular) and just relax. Some people vibe while stoned, some don't.
"Jesus, it's been 3 fucking hours, what the fuck is jessica doing?"
"Man, she's stoned af and vibing to some music. Let her be"
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.