Green’s Dictionary of Slang

(W.I.) a chatterer, a telltale; also attrib.

1943		cited in Cassidy & LePage Dict. Jam. Eng. (1980).
1983		T. White Catch a Fire 146: A gang of labrishers (gossiping idlers) joined them as they passed.
2004		D. Narain Contemp. Carib. Women’s Poetry 109: Bloom’s poem ‘For Mikey’, released from the demands of representing a Creole-speaker in her more usual ‘labrisher’ mode, demonstrates [etc.].