Thwacked, unthunk, undone and unfun. That feeling you get right before your face eats asphalt and also that feeling you have right after you stand up... If you stand up.
"That little brat, I thwunked her shit right up." "As puke was rising in my throat on the roller coaster I felt completely thwunk." "It's a bad moon tonight, this drugcombo thwunks"
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.