Meaning
Beyond meaning 'dust', in Patois 'dus' also means to move very fast, to speed off, or to outrun and leave someone far behind — kicking up dust as you go. 'Him dus weh' means he sped off, took off in a flash, and to 'dus' a rival in a race is to leave them eating your dust. The word turns the image of dust flying up behind a speeding runner or car into a lively verb for sheer speed and getaway, common in talk of racing, chasing, and making a quick escape.
Examples
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Di car dus weh dung di road.
The car sped off down the road.
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Him dus di whole a dem inna di race.
He left them all far behind in the race.
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As she see di rain, she dus gaan home.
As soon as she saw the rain, she rushed off home.
Origin
From 'dust' — the image of kicking up dust as you race off — extended to mean to move fast or leave others behind.
How it’s used
Chiefly 'to speed off / outrun'; also literally to dust something. 'Dus weh' = take off quickly.