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spaced-out

or spaced

[speyst-out or speyst]
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adjective Slang.
  1. dazed or stupefied because of the influence of narcotic drugs.
  2. dreamily or eerily out of touch with reality or seemingly so; spacey.
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Origin of spaced-out

1965–70, Americanism; on the pattern of phrasal verbs with out marking perfectivity; space apparently by association with “outer space” as, metaphorically, a place outside normal consciousness
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for spaced out

spaced out

adjective
  1. slang intoxicated through or as if through taking a drugOften shortened to: spaced
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012