Honestly, when someone throws that very deep question at me (which is pretty much rethorical), I just say " HEYYYYYY" ... and that's the perfect opportunity for this person to come up with something more interesting ^^ Remember you can always always always look "up" and start to describe the sky or the stars... the ceiling, etc. =D Or just say "good".

u can replay to them " waaaaaaaaaaassaaaaaaaaaaaaaaabbbbbbbbbbbii!!!"

the sky

It's another way of asking "How are you?" or "What are you up to?" My friend from Norway says it to me alot so i have come to get used to it lol. :) Hope this helps.

You can say," Nothing much, what's up in your part of the word?"