Well from yuh neva inform, mek no price pun yuh head,
Yuh friend dem nah vex wid yuh and want yuh ded

from Notch – Nuttin No Go So Lyrics on Rap Genius

Meaning

An “informer” is exactly what it implies. These are people that use information as a means of leverage to continue their criminal activities, by feeding whatever information the local authorities ask of them.

The term has also trickled down to simply being loudmouthed and just revealing people’s business in general.

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