When you are dabbed out, you are so high due to taking dabs (Butane Hash
Oil) that you are in a state of (
semi/un)consciousness.
It this level of high, the user is unable to take another
dab, thus "dabbed out".
Tony: "Oh man it's so late but I haven't even caught a buzz yet... Are you tryin' to do another
dab?"
Blake: *zzz*
Tony: "BLAKE! Wake the hell up
man..."
Blake: "Wha-... Oh shit. Sorry
man I've been smoking all day, I'm dabbed out."