The desirable high when you want to relax; not too sober, not too high, just high enough. Not to be confused with productivity highs, but to instead be related to laziness and relaxation. This is a substitute for the term "couch-stuck."
Jay: Yeah man, that bowl has got me lifted. I don't want to move my damn leg an inch.
Larry: Hell yeee, I'm clam-kushed as a mothafucka.