Meaning
A chronically sore, ulcerated, or injured leg — a persistent leg wound or 'leg sore' that will not heal, often associated with diabetes ('sugar') or an old injury. Since Patois 'foot' means the whole leg, not just the part below the ankle, 'bad foot' covers a bad leg in general, from a limp to a festering ulcer. It names a real and common affliction, especially among the elderly and the diabetic, and it belongs to the everyday talk of ailments, where a bad foot is a heavy, wearing trouble to carry.
Examples
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Di ole man have a bad foot weh nah heal.
The old man has a leg ulcer that won't heal.
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Him limp because a him bad foot.
He limps because of his bad leg.
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Dem dress di bad foot every day.
They dress the leg wound every day.
Origin
A compound — 'bad' plus 'foot' (which in Patois means the whole leg) — for a chronic leg sore or injury.
How it’s used
Chiefly a chronic leg ulcer/wound; broadly, an injured or lame leg. 'Foot' = the whole leg in Patois.