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spacy (adj.)

also spacey, 1852, "large, roomy, spacious," from space (n.) + -y (2). Meaning "felt as characteristic of outer space" (especially with reference to electronic music) is attested from 1971, probably influenced by spaced-out (1965, American English slang), a reference to the behavior of people using hallucinogenic drugs (see space (v.)).

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Definitions of spacy

spacy (adj.)
stupefied by (or as if by) some narcotic drug;
Synonyms: spaced-out / spacey
From wordnet.princeton.edu