Meaning
Posh, high-class, and refined — or, less kindly, stuck-up and snobbish. 'Stush' describes upscale style, sophistication, and a certain classy polish, but it just as often carries a sharper edge, naming the airs of someone who thinks themselves too good for ordinary people or things. So a 'stush' outfit or restaurant is smart and upmarket, while a 'stush' person may be admired for their class or mocked for their snobbery. It sits with 'topanoris' and 'hitey-titey' in the vocabulary of class, style, and pretension.
Examples
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She too stush fi eat from di cook shop.
She's too stuck-up to eat from the cook shop.
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Dem have a stush likkle restaurant uptown.
They have a posh little restaurant uptown.
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Nuh act stush wid mi, mi know weh yuh come from.
Don't act all high-and-mighty with me, I know where you're from.
Origin
Of uncertain origin (possibly from 'stoosh'/'stush' meaning stylish); it carries both the sense of genuine class and of snobbery.
How it’s used
Can be admiring ('classy, upscale') or critical ('snobbish'), depending on tone.