Meaning
To chatter on and on, talking too much and often indiscreetly — babbling gossip or blurting out things better left unsaid. As a noun it means idle, excessive talk, and a 'labba-labba mout' is a person who cannot stop running their mouth, forever prattling and telling what they should keep. The doubling drives home the endless, leaky flow of the talk, and it sits with 'blabba-mout' and 'chatty-chatty' in the vocabulary of the gossip and the tell-tale, a real fault in a culture that prizes holding one's tongue.
Examples
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Stop labba-labba an do di work.
Stop chattering and do the work.
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She labba-labba till she tell out di whole secret.
She babbled on until she blurted out the whole secret.
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Him have a labba-labba mout, cyaa keep nutten.
He's got a chattering mouth, can't keep anything to himself.
Origin
A reduplicated word imitating incessant chatter — the doubling of 'labba' stressing on-and-on talk. Related to 'labrish' (gossip).
How it’s used
Both a verb (to chatter) and a description of idle talk. Compare [[blabba-mout]] and [[chatty-chatty]].