Meaning
'Nuh buy puss inna bag' — don't buy a cat in a bag. Never buy or agree to something without inspecting it first, the proverb warns: check what you are getting, because a closed bag may hide something other than what you were promised. It is plain, shrewd advice against being cheated, urging you to open the bag, look the thing over, and know exactly what is on offer before you hand over your money or your word.
Examples
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Check di car before yuh pay; nuh buy puss inna bag.
Check the car before you pay; don't buy blind.
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Look inna di box first — nuh buy puss inna bag.
Look in the box first — don't buy something sight unseen.
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Him get rob because him buy puss inna bag.
He got cheated because he bought without checking.
Origin
From the old market trick of selling a cat in a tied bag in place of a piglet — the same image behind the English 'don't buy a pig in a poke'.
How it’s used
Practical advice for any deal — inspect before you commit, or you may be cheated.