It could also mean "What are you doing?" or "What have you been up to?"
Customer: What's up?
You: Oh not much, just working.
2015년 4월 6일
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something like "not much" might be ok in general. However, the one asking that could really mean how you are or something like "what's new?" Hope it helps!
2015년 4월 6일
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Customer: what's up
You: not much just working. What you got up today?