Does the greeting "what's up" imply friendly rapport or is it the new "hello"? And would it be rude if I answered with "the sky"?

Anonymous
The term “what’s up” implies a certain familiarity with a person and also that you feel comfortable with the person. It also signals to the other person that you are being casual and friendly. It implies that you and the other person have an amiable relationship.

The person who does this I always says "not much". But I've been toying with the idea of "the sky" just to tease a bit.

Unfortunately it's a one vote pole. So...
What's Up - The New Hello - Rude to say "The Sky"
Vote A
What's Up - The New Hello - Not Rude to say "The Sky"
Vote B
What's Up - Friendly Rapport - Rude to say "The Sky"
Vote C
What's Up - Friendly Rapport - Not Rude to say "The Sky"
Vote D
Select age and gender to cast your vote:
GirlGuy
Does the greeting "what's up" imply friendly rapport or is it the new "hello"? And would it be rude if I answered with "the sky"?
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