Meaning
Suddenly and with a crash or thud — an expressive word for something that happens all at once, often clumsily or dramatically. 'Bragadaps, him drop' means he fell in a single heavy instant, with a bang. Its very sound mimics the tumble or the impact it describes, and it belongs to a family of Jamaican sound-words (like 'bapps') that paint an abrupt, noisy action, capturing the shock and suddenness of a fall, a collapse, or a thing coming down hard.
Examples
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Bragadaps! Di whole stack a plate drop.
All of a sudden, the whole stack of plates crashed down.
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Him did a run, den bragadaps him tumble.
He was running, then all at once he took a tumble.
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Di door fly open bragadaps.
The door flew open with a bang.
Origin
An onomatopoeic word imitating a sudden, heavy fall or crash — the sound of the event built into the word.
How it’s used
More dramatic than 'bapps', carrying the sense of a crash or heavy landing along with the suddenness.