In native Australian aboriginal vocabularly, Widji Bandi means - a Gun, literally an emu shank or leg.
Indigenous Australians first referred to rifles as an emu leg due to the checkering in a rifle stock resembling, in its carving, the rough grain of the skin of an emu leg.

SOURCE: Diary of Ten Years Evenful Life of An Early Settler in Western Australia and the Discriptive Vocabularly of the Language of the Aborigines, by George Fletchjer Moore, 1842.