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a fancy way to say, 'no, what about you?,' like you're too good to be bothered by anyone else
'Nah you?' I said, 'I'm too busy being cool to care about your problems.'
'Nah you?' he asked, like I was the only one who could be bothered to respond.
'Nah you?' she said, because she was too lazy to say 'no' properly.