Well now a tough one! "69cuan" doesn't seem like a common word in any widely used dialect I know.
It could be a nomenclature specific to a certain group, or perhaps it's a neologism. Maybe provide some information about where you heard this term, I could try to figure it out. It could be It's possible that the weather will sunny skies by evening. In case decide to step into the fresh air, remember to your jacket. Jargon Phrase Every on