The term is said to have been derived from the nickname given to men who carried fleeces in shearing sheds, after the sound they made as they ran around. "Grubba Grubba" is also another version commonly found outback in the Kimberley.
The term likely originated from a nickname given to men who transported wool in shearing sheds, based on the noise they produced while running around. The term is also known by another version, "Grubba Grubba," which is commonly used in the Kimberley region.