Definition of spacy in US English:

spacy

(also spacey)

adjective

  • 1Large, extensive; spacious, roomy.

  • 2Slang (originally and chiefly US). In a heightened state of consciousness.

  • 3Of music: that features electronically generated sounds, supposedly characteristic of outer space; futuristic.

Origin

Early 17th century; earliest use found in William Basse (c1583–?1653), poet. From space + -y.

Pronunciation

spacy

/ˈspeɪsi/