What does he mean when he says "What's up girl?"?

Anonymous
What do guys expect you to say back when they say "Sup girl"? this guy I go to college with will say that to me through texting. I know how to reply, but I am just wondering why guys text that? And what do they usually want to hear from the girl? Is there a deeper meaning to it?
What does he mean when he says "What's up girl?"?
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