Meaning
To 'burn fire' on something — to loudly condemn, denounce, and reject it as corrupt, wicked, or wrong. Drawn from the Rastafari idea of symbolic, purifying fire directed at evil, injustice, and 'Babylon', 'bun a fyah' calls down cleansing flame upon what is rotten, with no literal burning involved. It is one of the most forceful expressions of Rastafari denunciation, and to 'bun fyah' on a person, a system, or a practice is to disown and damn it utterly as something the fire should consume.
Examples
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Rasta bun a fyah pon corruption an oppression.
Rastafari denounces corruption and oppression.
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Wi bun a fyah pon dat wickedness.
We condemn that wickedness utterly.
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Fyah fi di system weh keep di people down.
Fire (condemnation) upon the system that keeps the people down.
Origin
From Rastafari 'fire' symbolism: 'fyah bun' (fire burn) is purifying judgement called down on evil and 'Babylon'. To 'bun a fyah' on something is to denounce it — symbolic, not literal, fire. See [[babylon]].
How it’s used
Central to Rastafari and dancehall speech; a declaration of moral condemnation. Symbolic, not a call to literal arson.