Basically;
You’re so high on
weed (hence, “green” out), that you are totally useless. Common effects of greening out would be horrible
munchies, motor functions are almost gone, you can’t speak coherently, memory loss from the night of, nausea, vomiting, etc.
In other terms, it’s like getting blacked out drunk, but instead of alcohol, it’s
weed.
Jason: Dude, last night I got so zooted I couldn’t even walk.
Cam: Aw
bro, did you green out?
Jason:
maybe, can’t remember much man.