far-out

The compound 'far-out' emerged in American English slang in the mid-20th century, originally within jazz and counterculture communities. It is a spatial metaphor, where 'far' and 'out' both intensify the sense of distance from a conventional center or norm. The literal idea of being positioned at a great external distance evolved figuratively to describe ideas, art, or styles perceived as extremely unconventional, avant-garde, or radically different from the mainstream. By the 1960s, its meaning broadened in informal use to also express admiration for something excitingly unconventional, thus capturing both strangeness and appealing excellence.

Structure: far (distant) + out (external) 'far' is from Old English 'feorr' (to a great distance), of Germanic origin. 'out' is from Old English 'ūt' (outwards, external), also of Germanic origin. In this compound, both elements function as adverbial particles that combine to form an adjectival sense.