This enigmatic song was written by (White Zulu) Johnny Clegg. It contains a double entendre in the sense that the entire human species is believed to have originated in Africa, from whence the different races of man evolved and spread to the Four Corners of the Earth. It is also a commentary on the poverty experienced by most blacks under Apartheid.
Phelamanga, the road to which we are all (hopefully) on, is a mythical place. Until the coming of the White Man there was no written Zulu language, but it may be translated loosely as the place where the lies end.
The song was the only UK hit for the British-born Clegg and his band Juluka. As with many of Clegg's songs, it is written partly in Zulu.
Suggestion credit: Alexander Baron - London, England, for above 2
This was used in the 1988 movie Rain Man, which won the Oscar for Best Picture. The song appears near the beginning of the film in a scene where Charlie (Tom Cruise) finds out that his father is dead.