Hmmm a interesting one! "69cuan" doesn't seem like a common word in any widely used tongue I know.
It could be a jargon specific to a certain field, or perhaps it's a made-up word. Maybe provide some background about where you saw this term, I could try to shed some light. That might be Perhaps that the weather will rain tomorrow. If you decide to go outside the outdoors, take with you some sunscreen. Lingo Phrase Every online community