From an Aboriginal Australian language (probably of Western Australia) bundi ("stone").
boondie (plural boondies)
- A stone thrown as a weapon; a heavy club.
1969, W. Michael Ryan, White Man, Black Man: The true story of a white man who was initiated into an Aboriginal tribe:
- […] I gathered my gun and boondie and went with him.
- 1987, John Meredith, Hugh Anderson, Roger Covell, Patricia Anne Brown, Folk Songs of Australia and the men and women who sang them, Volume 2, page 202,
- Look, Jimmy, there goes the girls! / Were the words about the victims said; / The criminal ran them down / And with his boondie killed them dead.