It is a Singlish slang in Singapore. Used to seem kind of fierce but can be used as a friendly term as well. Used when people call your name or ask you for help or a question. It is a hokkien word which translates to "What?" or "What do you want?"
Friend : "Eh, (Name)!"
You: "Anzua?"
or
Friend: "Eh, I need your help for something."
You: "Anzua?"
by 4YearARMYTaetaeVBTS June 3, 2020
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