Green’s Dictionary of Slang

(US drugs) both drunk and stoned.

1973		Eble Campus Sl. Mar. 1: droned – out of tune with normal awareness; combination of drunk and stoned.
1996		Eble Sl. and Sociability 38: Although blends are fashionable in the marketplace, college slang makes little use of this process of word formation, with only about a dozen examples collected since 1972: [...] droned (drunk + stoned) ‘unaware because of alcohol or drugs’.