Meaning
A quarrel, dispute, or contention — the argument itself and the gossip, bad blood, and tale-bearing that swirl around it. When 'kas-kas buss', a noisy falling-out has broken open between people, often over 'susu' (whispered gossip) carried from one to another. The doubled word captures the back-and-forth of a heated dispute, and it names not just a single row but the whole simmering feud of accusation and hard words between neighbours or friends.
Examples
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A big kas-kas buss between di two family.
A big quarrel broke out between the two families.
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Mi nuh inna nuh kas-kas.
I'm not part of any dispute.
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Di kas-kas start ova a likkle money.
The quarrel started over a little money.
Origin
A reduplicated Jamaican word for strife, likely from 'cast' (to cast blame or aspersions); doubling stresses the back-and-forth of the dispute.
How it’s used
Close to 'cuss-cuss', but 'kas-kas' leans on the ongoing quarrel and bad feeling rather than the cursing itself.