what does this sentence exactly mean : tu cheez badhi hai mast mast; as a girl can i say it to a boy

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Difficult to translate "mast" but it means you are fantastic or superb.You can say this to a boy.

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It mean  " You are a exotic or sexy or splendor , beautiful ,C an use for any those words depend n the mood of speaker ,

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Tu cheez badi hai mast mast means " You are a fabulous thing". So you can use it for boy as well as for girl also.