Meaning
To light up and smoke ganja — 'blaze up di spliff' means to spark it and smoke. More widely, to 'blaze' is to burn or set alight, and in Rastafari speech 'fire blaze' can mean to condemn wrongdoing, calling down purifying flame on evil as with 'bun a fyah'. So the word runs from the literal lighting of the herb to the blazing of fire and on to the symbolic fire of denunciation, all sharing the sense of flame kindled, whether in the chalice, on the wood, or against wickedness.
Examples
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Dem blaze up di chalice an reason.
They lit up the chalice and reasoned.
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Blaze one fi di elders.
Light one (a spliff) for the elders.
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Fire blaze pon corruption!
Fire burns on corruption! (condemnation)
Origin
From 'blaze' (to burn/flame); applied to lighting ganja and, in Rasta speech, to symbolic fire against evil.
How it’s used
Chiefly to smoke ganja ('blaze up'); also literal burning and Rasta 'fire' condemnation. See [[bun-a-fyah]], [[ganja]].