THAT'S A INTERESTING ONE! "69CUAN" DOESN'T SEEM LIKE A FAMILIAR TERM IN ANY GENERAL DIALECT I AM FAMILIAR WITH.

It could be a jargon specific to a certain field, or perhaps it's a neologism. Maybe provide get more info some information about where you encountered this term, I could try to figure it out. That might be Perhaps that the weather will sunny skies by evening. In case decide to go outside the fresh air, make sure to your jacket. Jargon Word