Meaning
Nothing — the Patois pronunciation of 'nothing'. 'Nutten nah gwaan' means nothing is happening, and 'it nuh mean nutten' is it means nothing. As with all Patois negatives, doubling up ('mi nuh have nutten') is normal and correct, the piled negatives strengthening rather than cancelling the sense. Among the most common everyday words, 'nutten' does the plain work of naming the absence of anything, and it sits with its more clipped cousin 'nuh'n' at the everyday end of the language.
Examples
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Nutten nah gwaan, mi just a cool.
Nothing much is happening, I'm just relaxing.
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Him nuh do mi nutten.
He didn't do anything to me.
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Nutten nuh wrong wid dat.
There's nothing wrong with that.
Origin
The Patois pronunciation of 'nothing', with the 'th' becoming 't'.
How it’s used
Note the double negative ('nuh... nutten') is standard and grammatical in Patois, not an error.