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Nadada is the Bay Area's way of saying 'no' but with a side of attitude and a little bit of disrespect. It's like saying 'I don't know what you're talking about and I don't care.'
'Nadada, bro. I didn't even hear you say that.'
'Nadada? You just walked into my room and expected me to know what you wanted?'
'Nadada, I'm not even mad. I'm just tired of your nonsense.'