Meaning
Very foolish, silly, or simple-minded — the doubling of 'fool' intensifying it, describing someone who acts really stupidly or a thing that is plain nonsense. 'A fool-fool bwoy' is a right idiot, and a 'fool-fool ting' is utter foolishness. The reduplication drives the sense home, marking not a passing bit of silliness but a thoroughgoing foolishness, and it sits with 'eediat', 'mumu', and 'chupid' in the well-stocked Jamaican vocabulary of the foolish, aimed at the plainly, hopelessly senseless.
Examples
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Stop di fool-fool behaviour.
Stop the silly behaviour.
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Him tek mi fi fool-fool, but mi wise up.
He took me for a fool, but I wised up.
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A fool-fool mistake mi mek.
It was a really silly mistake I made.
Origin
A reduplication of 'fool' — the doubling intensifies, a common Patois pattern (compare 'chaka-chaka', 'likky-likky').
How it’s used
Intensified 'foolish'; can be teasing or a genuine insult depending on tone.