Australia, 1948—a period allocated for private conversation, especially between women on isolated stations, over an outback radio network—by extension (1967): any long chat—‘galah’: a very common Australian cockatoo
New Zealand, 1970—at full speed—perhaps after ‘flat out’ (i.e., with the maximum speed or effort) and after ‘quicksticks’ (i.e., quickly, without delay)
Australia, 1911—a potato farmer—composed of ‘spud’ (a potato) and ‘cocky’ (a farmer working a small-scale farm)—‘cocky’: shortened form of ‘cockatoo’ (a farmer working a small-scale farm)
British slang, 1960s—‘to disappear up one’s own arse’: to become self-involved, pretentious or conceited—‘to be up one’s own arse’: to be self-involved, pretentious or conceited