Meaning
'Wha sweet nanny goat a go run him belly' — what tastes sweet to the goat now will give it a bad stomach later. Short-term pleasure often leads to future pain, the proverb warns: just as the tasty leaves the goat greedily eats will run its belly, the indulgence, temptation, or reckless enjoyment of today can bring suffering and regret tomorrow. It is a shrewd caution against being led by present sweetness into trouble down the road, weighing the pleasure against its price.
Examples
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Him spend all him money a enjoy himself. Wha sweet nanny goat a go run him belly.
He spent all his money enjoying himself. What tastes sweet now will trouble him later.
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Think before yuh dweet — wha sweet nanny goat a go run him belly.
Think before you do it — present pleasure can bring future pain.
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Di sweetness done quick an di regret come. Wha sweet nanny goat a go run him belly.
The pleasure passes quickly and the regret arrives. Sweet things can sour the stomach.
Origin
A farm image: 'nanny goat' is a female goat, and the sweet leaves it eagerly eats can 'run its belly' (cause diarrhoea). The pleasure-then-pain lesson is drawn from that.
How it’s used
A caution against reckless indulgence and its consequences.