galah /ɡəˈlɑː/ noun2 •A member of species Eolophus roseicapilla of pink and grey species of cockatoos, native to Australia.The change is pleasant in many ways; the grass is better and there is a good road to travel on; pigeons in crowds fly all around, galahs and other birds make merry everywhere. — 1879 •(Australia, slang) A fool, an idiot.That galah nearly drove me off the road. formsgalahs