The definition of far out is slang for something that is unusual or innovative.
An example of far out is a really hot new outfit worn by a fashion model that is very different from anything ever designed before.
Informal very advanced, experimental, or nonconformist; esp., avant-garde
Extremely unconventional: “all kinds of far-out and unique inventions” ( Peter Nissenson )
(comparative more far-out, superlative most far-out)