Meaning
The buttocks — especially a large, curvy, shapely backside, much celebrated in dancehall song and dance. The slang grew from the plain meaning of 'bumper', the bumper of a car, and it carries an admiring, appreciative note, the 'bumpa' being prized in the music's frank celebration of the full female figure. It is a fixture of dancehall lyrics and of everyday, cheeky talk about a woman's shape.
Examples
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Di song a praise big bumpa.
The song is praising a big backside.
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She have a healthy bumpa.
She has a full, curvy backside.
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Di car bumpa mash up inna di bounce.
The car's bumper got smashed in the collision.
The literal 'car bumper' sense the slang comes from.
Origin
From English 'bumper' (of a car), applied playfully to a rounded backside — the part that sticks out behind.
How it’s used
A common, admiring dancehall term for the female backside. Milder and more playful than the vulgar body words.