Green’s Dictionary of Slang

bungo adj.

[bungo n.]

(W.I., Jam.) crude, boorish, ignorant.

[WI]W. Jekyll Jam. Song and Story 12: His speech is Bungo talk.
[US]C. McKay ‘Flat-Foot Drill’ Constab Ballads 13: Right tu’n, you damn’ bungo brut!
[US]C. McKay Banjo 78: A really and truly down-there Bungo-Congo.
[WI]L. Bennett ‘Obeh Win De War’ in Jamaica Dialect Verses 6: Me always get out cross w’en uncle / Cuss me bungo fool.

In compounds

bungo-talk (n.)

(W.I.) illiterate speech, the lowest level of uncultivated Jamaican speech.

[WI]W. Jekyll Jam. Song and Story 12: His speech is Bungo talk.
[US] in Lalla & D’Costa Lang. in Exile 97: What is today classified as the ‘bungo talk’ of Annancy is actually stigmatized archaic basilectal creole.