What is ‘paupo-upo’ in English? (meaning, not doing anything very important)

You will use ‘around’

Collins Dictionary’s one usage of ‘around’: You use ‘around’ . . . when you are saying that someone is spending time and not doing anything very important.

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panuod-nood

Panuod-nood ka lang. Di mo gustong tumulong.

You are just watching around. You don’t like to help out.

 

paupo-upo

Bakit ka paupo-upo lang diyan?

Why are you just sitting around there?