Meaning
Fake, knockoff goods made to imitate expensive designer brands — 'dupes' of Clarks, Gucci, Nike, and the like, sold cheaply in markets and by street vendors. Modern slang. Someone flossing in 'dupes' is showing off imitation gear rather than the real thing.
Examples
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Him a floss but a pure dupes him a wear.
He's flossing but it's all fakes he's wearing.
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Di vendor sell dupes fi cheap.
The vendor sells knockoffs cheaply.
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Real Clarks or dupes? Yuh cyaa tell.
Real Clarks or fakes? You can't tell.
Origin
From 'dupe' (a copy/imitation); modern slang for knockoff designer goods.
How it’s used
Fake/knockoff designer goods. Compare 'floss', 'fresh', 'clarks', 'wamp'.