1
general::
1. Unusual or eccentric; very advanced. For example, Painting blindfolded, that's far out, or Her child-rearing theories are far out. 2. 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. [Colloquial; mid-1900s]
American Heritage Idioms
2
general::
Phrase(s): far out
1. Lit. far from the center of things; far from town. • The Smiths live sort of far out. • The restaurant is nice, but too far out. 2. Sl. great; extraordinary. • This jazz is really far out! • You want to hear some far out heavy metal? 3. very hard to understand; arcane; highly theoretical. • This physics chapter is too far out for me. • I can’t follow your far out line of reasoning. 4. intoxicated. • Three beers and Wally was really far out.
McGrawhill's American Idioms And Phrasal Verbs