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Longman Dictionary of Contemporary English
way-out
adjective
EXAMPLES FROM OTHER ENTRIES
▪ I like some jazz, but not the way-out stuff.
Douglas Harper's Etymology Dictionary
way-out

1868, "far off," from way (adv.), short for away, + out. Sense of "original, bold," is jazz slang from 1940s, probably suggesting "far off" from what is conventional or expected.

Wiktionary
way-out

a. 1 unusual, unconventional or strange 2 (context US slang English) out of the mainstream of society

WordNet
way-out

adj. informal terms; strikingly unconventional [syn: far-out, kinky, offbeat, quirky]