Meaning
'A nuh everyting gud fi nyam gud fi talk' — not everything that is good to eat is good to talk about. Some things — private business, hard truths, matters that could stir up trouble — are best kept to yourself, even when you know them, the proverb counsels. Just as you may enjoy a good meal without describing it to all, you may know a thing and hold your tongue about it. It is shrewd advice for discretion, warning that speaking freely of everything you know can bring needless trouble down on you.
Examples
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Mi know di secret, but a nuh everyting gud fi nyam gud fi talk.
I know the secret, but not everything good to eat is good to talk about.
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Keep it to yuhself — a nuh everyting gud fi nyam gud fi talk.
Keep it to yourself — some things are better left unsaid.
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Him learn seh a nuh everyting gud fi nyam gud fi talk.
He learned that not everything you know should be repeated.
Origin
A food image: just as some tasty things are best eaten quietly and not announced, some knowledge is best swallowed and not spoken.
How it’s used
A caution about discretion — knowing when to hold your tongue. Often said to warn against gossiping or revealing private matters.