The word galah is a borrowing into Australian English from the Aboriginal Yuwaalaraay language of northern New South Wales. In early records it is variously spelt as galar , gillar , gulah , etc.
Some early settlers use the galah as food.
Some writers report that galah pie was a popular outback dish. The galah, which usually appears in a large flock, has a raucous call, and it was perhaps this trait which produced the term galah session for a period allocated for private conversation, especially between women on isolated stations, over an outback radio network. It is a special time set aside for lonely station women to chat on whatever subject they like'. Very commonly in Australian English galah is used to refer to a fool or idiot. But this explanation has not been accepted, and the Australian meaning must be a transfer from the bird, no doubt incorporating a judgment about the relative intelligence of the bird.