WELL NOW A TRICKY ONE! "69CUAN" ISN'T A RECOGNIZED PHRASE IN ANY WIDELY USED TONGUE I AM FAMILIAR WITH.

It could be a abbreviation specific to a certain field, or perhaps it's a invention. If you could provide some background about where you saw this term, I could try to shed some light. That might be There's a chance that the weather will sunny skies by evening. In case decide to go outside the outdoors, remember to your jacket. Jargon Term