Green’s Dictionary of Slang

1. (US) drunk or intoxicated by a given drug.

1971		Current Sl. VI 11: Zoned, adj. drunk.
1979		H. Feldman et al. Angel Dust 170: I was zoned. I was in the ozone.
1981		J. Ellroy Brown’s Requiem 249: It was due to a system full of codeine. I discontinued their use after two days. I couldn’t afford to be zoned out.
1990		(con. early 1950s) J. Ellroy L.A. Confidential 201: Pinned eyes – maybe zoned on some kind of hop.
1998		Source Nov. 136: We walk in to find a zoned-out B-Real enjoying a screening of Shaft.
2000		R.G. Barrett Leaving Bondi (2013) [ebook] Les [...] just stared through the windscreen, totally zoned out.
2001		J. Stahl Plainclothes Naked (2002) 152: Zoned-out, Tony raked idly at the scabs on his face, clamping and unclamping his jaw as though cracking invisible walnuts.
2012		M. Wilkerson ‘A Clean White Sun’ in ThugLit Sept./Oct. [ebook]He’s straight zoned.
2016		V. McDermid Out of Bounds (2017) 15: Zoned-out junkies with blank eyes.

2. disorientated.

1983		Eble Campus Sl. Mar. 6: zoned out – not in touch with reality.
1993		T. Jones Pugilist at Rest 85: Goddammit, are you zoned or what?
1997–2000		Da Bomb 🌐 32: Zoned out: Can’t think.
2009		T. Black Gutted 97: You’ve been so zoned lately, it [i.e. psycho-therapy] might help.