Def and Far-out

Def adjective - Keenly aware of and responsive to the latest developments especially in fashion and entertainment.

Far-out and def are semantically related. In some cases you can use "Far-out" instead an adjective "Def".

Far-out adjective - Different from the ordinary in a way that causes curiosity or suspicion.

Def and far-out are semantically related. Sometimes you can use "Def" instead an adjective phrase "Far-out".