O.E. feorr "to a great distance, long ago," from P.Gmc. *ferro (cf. O.N. fjarre, Du. ver, Ger. fern), from PIE *per- "through, across, beyond" (cf. Skt. parah "farther, remote, ulterior," Hitt. para "outside of," Gk. pera "across, beyond," L. per "through," O.Ir. ire "farther"). Far East "China, Japan, and surrounding regions" is from 1852.
Unusual or eccentric; very advanced. for example, Painting blindfolded, that's far out, or Her child-rearing theories are far out.
An interjection meaning “great” or “cool,” as in All he could say when he won the lottery was “Far out!” Originally a slang term for daringly creative jazz, this expression has been applied to other art forms and undertakings.
[ ; mid-1900s