grok
How could we forget, Juan?
Originally the Martian word for "drink" I believe.

And, then, of course, "burned-out" or "all burned-out" [on drugs] came to take on a more ominous tone as more peoples' lives began to shipwreck on substance abuse in the 70's.
I've heard the term "gouching" used to describe people totally blissed out and unconcerned by the world, but definitely with negative connotations. Implies a slack-jawed out-of-it state. Anyone know if that was a 60s term? I suspect it's more 70s heroin abuse territory.

"Man, I ain't no burn-out!" would have a modern equivalent (dunno if this is UK only) of "I'm not a stoner!"