The message
from "Dave Plowman (News)" contains these words:

Blimey - 'copacetic' - there's my new word for the day. Apparently it's
been used just once before in the archived history of this newsgroup -
by Mr Mike Ring in 2001.

And the UK dictionary and spellchecker I have on this machine doesn't
recognise it...

http://www.nexistepas.com/enthuse/in...tag/copacetic/

My 'dead tree' (Collins) dictionary has it and claims it is US and
Canadian slang. The title page has disappeared but I think this one was
from some time in the 80s.

--
Roger Chapman