One more on the list of alternate words for Stoned.
To have smoked enough Marijuana to have reached a high bordering on the bad side but it still feels great, you just feel partially confused.
The word reffers to the Stone Henge in England U.K. the stones are of unknown origin, just like the blunt that got you henged.
"Dude, why do I feel so baked? I haven't been smoking much..."
"You cooked a fat blunt, man you must be henged!"