Meaning
Besides the food grain, 'corn' is common slang for money — a good 'earning' or payout, as in 'mek a corn' (make some money). In harder dancehall/street talk it can also mean bullets. Context makes clear which sense is meant.
Senses
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noun The literal grain — maize, ground for cornmeal or roasted on the cob.
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Roast corn sell pon di roadside.
Roast corn is sold on the roadside.
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noun Slang for money, especially a good payout — 'mek a corn' means to make some money.
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Him mek a nice corn off di deal.
He made a nice bit of money off the deal.
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Origin
The money sense likely from the idea of corn as a valued harvest/store of wealth; the harsher 'bullets' sense is dancehall street slang.
How it’s used
Everyday senses are the grain and 'money'. The 'bullets' sense belongs to violent street/gun talk — context dependent.