dazed or stupefied because of the influence of narcotic drugs.
2.
dreamily or eerily out of touch with reality or seemingly so; spacey.
Also, spaced.
Origin: 1965–70, Americanism; on the pattern of phrasal verbs with out marking perfectivity; space appar. by assoc. with “outer space” as, metaphorically, a place outside normal consciousness
mod. silly; giddy. : I have such spaced out parents!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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[speyst-out] 
