Meaning
Top-quality ganja — the finest, strongest herb, as against cheap, harsh, low-grade weed. Prized among smokers and much referenced in reggae and dancehall, 'high grade' is the good stuff, the premium herb worth paying for, and to smoke 'pure high grade' is a boast of quality. It sits among the many Jamaican words for ganja and its grades, and the phrase has spread well beyond the island into the wider language of the herb.
Examples
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Him only smoke di high grade, nuttin less.
He only smokes the top-quality herb, nothing less.
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Di high grade strong an clean.
The high grade is strong and clean.
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Plenty tune big up di high grade.
Plenty of songs celebrate the top-quality herb.
Origin
From 'high grade' (top quality) — applied specifically to premium ganja; reinforced by the double sense of the 'high' it delivers.
How it’s used
Refers specifically to premium-quality cannabis. Common in reggae/dancehall lyrics.