They usually say see you startside. At least that's what I feel like I've heard a lot. Maybe this is just a different take on that. Starside referring to venturing space, cloudside bringing it a little closer to home? Just my half awake ramblings.

I wanna say it is their own little exit note, like if you ever watched cowboy bebop, it always ends with see you in space cowboy. Its that kinda thing.