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A fancy, snobby way of saying 'Mate' that posh people use so they don't look like chavs who say 'Mate' too much.
'Oh, you're my Maatus?' 'I thought you were my brother.'
He said 'Maatus' like it was a title, not a word.
She used 'Maatus' so much, I thought she was trying to be a Latin king.