Green’s Dictionary of Slang

bobo-johnny n.

[? Yoruba buburu, bad, evil + johnny n.1 (2a)]
(W.I.)

1. a bogeyman, an imaginary monster conjured up to frighten naughty children.

[WI]Allsopp Dict. Carib. Eng. Usage.

2. a peasant, an unsophisticated country person.

[WI]Allsopp Dict. Carib. Eng. Usage.