Green’s Dictionary of Slang

juba n.

(S.Afr.) a white man.

[SA]A. La Guma Walk in the Night (1968) 53: ‘Listen, Gipsy, what you let the girls mess with these boggers for?’ [...] ‘You. What the hell you talking about?’ ‘These jubas. They just messing our girls’. [Ibid.] 68: Mikey’s a good boy. He’s not like you jubas. He got class.