Green’s Dictionary of Slang

1. (US) intoxicated, esp. by drugs.

1961		L. Block Diet of Treacle (2008) 16: Stoned, smashed, blind, turned on and flying so high.
1962		(con. 1953–7) L. Yablonsky Violent Gang (1967) 81: He seemed quieter than the others, and might possibly have been ‘turned on’ drugs.
1971		M. Novotny Kings Road 146: Anything that might give me a kick – I’ll try it all. I often get turned-on.
1984		‘Derek Raymond’ He Died with His Eyes Open 104: I’ve heard it said that you’re not all that hot in the sack. But if you’re turned on all the time that’s hardly surprising.
2001		ONDCP Street Terms 22: Turned on — Introduced to drugs; under the influence.

2. sexually stimulated.

1967–8		Baker et al. CUSS 215: Turned on Sexually aroused.
1978		L. Kramer Faggots 31: Fred realized, horror of horrors, that he was getting turned on.
1988		P. Califia Macho Sluts 37: You’re so turned on, I think I could make you come right now.
1999		‘Master Pimp’ Pimp’s Rap 62: I could tell that Candy was really getting turned on with this dike.
2008		T. Dorsey Atomic Lobster 105: A little bit ago I thought she was the hottest chick I’d ever seen, but for some reason I’m not that turned on anymore.

3. excited, moved.

1969		D. Di Prima Memoirs of a Beatnik 164: [D]ishing out beef stew [I] found myself in the middle of Howl by Allen Ginsberg. Put down the ladle, and [...] was caught up immediately in that sad, powerful opening: ‘I saw the best minds of my generation destroyed by madness...’ I was too turned on to concern myself with the stew.
1973		R. Daley Target Blue 34: If Durk’s got these [college] kids all turned on, he needs a place where he can put them.