Green’s Dictionary of Slang

jellied adj.

[jelly bean n. (5a)]

under the influence of tranquillizers.

[Scot]I. Welsh ‘A Smart Cunt’ in Acid House 202: It’s Ronnie [...] He’s really jellied.
Crew 2000 🌐 In fact they will be more vulnerable to anything dodgy if they are really ‘Jellied’.