Meaning
A killer — literally, but in dancehall an admiring word for something or someone deadly good. A 'killa' tune destroys the competition; a 'killa' performer wipes out rivals. It also names a fearsome badman. A common part of deejay names (Bounty Killer).
Examples
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Dat tune a killa!
That tune is a killer (a smash)!
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Him drop a killa pon di sound bwoy.
He dropped a killer tune on the rival sound.
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Di deejay name 'Killa' fi him tough style.
The deejay is named 'Killa' for his tough style.
Origin
The Patois pronunciation of 'killer'; in dancehall, admiring slang for something deadly good, and a common tough deejay name.
How it’s used
Admiring — a 'killer' hit/performer; also a badman. Compare 'murda', 'bad like yaz'.