literally (1845): an enclosure in which calves are isolated from their mothers until weaned—figuratively, humorously and offensively (1885): a girls’ boarding-school—similar to the use of ‘cow’ to derogatorily designate a girl or woman
Australia—1897: the typical bushman—1915: the typical Australian private soldier—a blend of the male forenames ‘Bill’ and ‘Jim’, as often used of bushmen
1969—associated with Malcolm Fraser, Prime Minister of Australia from 1975 to 1983, who borrowed it from George Bernard Shaw’s Back to Methuselah (1921)
chiefly Australian, 20th century—formula for estimating the size of rural holdings—also used figuratively of someone who talks boastfully without acting on their words
Australia, 1932—also ‘Flemington confetti’ (1933) and ‘farmyard confetti’ (1967)—bullshit (i.e., nonsense, rubbish)—also occasionally used literally in the sense of faeces
UK, 1967—indicates that something has been formulated or devised hurriedly, roughly or carelessly, as though sketched or scribbled on the back of a cigarette packet
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)