Meaning
To show off and flaunt wealth, style, or success — parading fresh clothes, jewellery, cars, or a fistful of money for others to see and envy. Someone 'flossing' is putting their prosperity on open display, and the word is common in dancehall's celebration of 'bling', status, and living large. To floss is to make your money and your style visible, a proud, deliberate performance of having arrived, and it belongs to the whole culture of style and display, where being seen to prosper is half the pleasure of prospering.
Examples
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Him a floss wid him new car.
He's showing off with his new car.
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She floss up inna di dance wid all har jewellery.
She flaunted all her jewellery in the party.
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Dem love floss pon social media.
They love to flaunt on social media.
Origin
From American hip-hop slang 'floss' (to flaunt/show off), fully adopted into dancehall and Jamaican youth speech.
How it’s used
To flaunt wealth/style; tied to 'bling' culture. Compare 'shine-eye', 'stush'.