Hmmm a tough one! "69cuan" doesn't seem like a familiar word in any widely used language I have come across.
It could be a abbreviation specific to a certain industry, or perhaps it's a made-up word. Perhaps provide some information about where you heard this term, I could try to figure it out. That might be There's a chance could change to sunny skies by evening. In case decide to venture out the fresh air, take with you an umbrella. Lingo Term