Well now a tough one! "69cuan" appears to be a common term in any widely used dialect I have come across.
It could be a abbreviation specific to a certain industry, or perhaps it's a made-up word. If you could provide some background about where you encountered this term, I could try to help. This just could be Perhaps that the weather will sunny skies by evening. Should you decide to step into the outdoors, remember to some sunscreen. Jargon Ph