[Windflier]

Also “far out!” was early 70s, and is absent.

"Far out" was sixties - not seventies.

I know that's a bummer, dude. You rock anyway.

[dfwgator]

Well dangit, I said it in the 70s.

[Steely Tom]

Yeah, that occurred to me, but John Denver took it into the 70s big time.

I think I remember Officer Joe Friday using the expression sarcastically while giving a long-hair a good chewing out. Guy was all "you're bumming me out, man!" Friday just stared at him in disgust.