Green’s Dictionary of Slang

(W.I.) an unsophisticated, ignorant person, a countrified person.

1799		‘Buddy Quow’ in Lalla & D’Costa Lang. in Exile (1990) 111: When Uncle Quaco say, / De pickney he was coming now, / I no go morrow stay.
1812		Montgomery; or, The West Indian Adventurer II 91: ‘Him no mind that, sometime,’ said Quaco; ‘him cann’t fum buckera, but he will fum me, if we tand too long in a pass’ [...] Quaco seemed a negro of mild disposition and felt for the suffering of our hero [...] but still the dread of fum-fum overcame in some measure this sympathy.
1828		Marly; Planter’s Life in Jamaica 299: The whole lingo was down right Greek to Quaco; but he answered with a bow, ‘Yes, busha.’.
1833		M. Scott Tom Cringle’s Log (1862) 83: Two red nightcap, one long knife, / All him get for Quackoo.
1858		in Trinidad Sentinel 8 Apr. n.p.: Quacoo, cum see mud fish?
1929		M. Beckwith Black Roadways 207: Say ‘Quaco won’ come!’ / How Quaco fe come? / Fo’ dem hab him in a sheckle.
1931		Shelby & Stoney Po’ Buckra 255: Stepney, Quacco, Sambo, Dublin, Useful, that makes him the old woman’s great-great-grandfather.