The darkies made boomerangs as a child's toy.... the adults just chucked lumps of wood at animals heads.... they didn't use boomerangs.
I will believe the educated people in your country. I will roll my eyes at the musings of Australia's version of a "redneck", you roaring gorilla.
"Boomerangs have many uses. They are weapons for hunting birds and game, such as emu, kangaroo and other marsupials. The hunter can throw the boomerang directly at the animal or make it ricochet off the ground. In skilled hands, the boomerang is effective for hunting prey up to 100 metres away.
When hunting for birds, either returning or non-returning boomerangs can be used. A returning boomerang can be thrown above a flock of ducks to simulate a hovering hawk. The frightened birds then fly into nets set up in their flight path or, if they come within range, the hunters can use non-returning boomerangs to bring the birds down.
Boomerangs can be used to kill fish in areas of high tidal variation where fish are trapped in beach or rock pools. Designed to slice through water, these boomerangs are heavier and have none of the aerodynamic qualities of flying boomerangs."
