An obambo is a type of ghost among certain peoples of Central Africa.
Description
An obambo initially resides in the bush, but eventually gets tired of this and appears to a close relative, requesting that he build a house for him near his own. That night the village women are gathered to dance and sing, and next day the people visit the grave of the deceased and make a rough idol. They then erect a little hut near the house of the person the obambo visited; then place the bier on which the deceased was carried to his grave inside the hut, as well as some of the dust from the grave. A white cloth is then draped over the door.
An alternative meaning is the ghost of somebody who died in the bush and has no grave.
References
Obambo Wikipedia(Text) CC BY-SA