Green’s Dictionary of Slang

1. a euph. for a given obscenity, usu. damn v.

1866		Maidstone Teleg. 19 May 3/6: Here you are plenty for eating and drinking without (blanking) about and slaving yourself to death, and who the (blank’s) going to pay for lodgings, when the (blanked) guardians are paid to look after us.
1876		B. Harte Gabriel Conroy II 222: ‘Blank it all,’ I said to myself, ‘Blank it all, Star, you ain’t goin’ to pop out upon a man just as he’s ministering to Beauty.
1884		Sporting Times 12 Jan. 1/2: ‘Blank you! [...] I don’t pay you tact as a bally dromedary’.
1895		Taranaki Herald (NZ) 12 Oct. 2/9: Blank this for a picnic! said the swaggie.
1895		Truth (Sydney) 14 Apr. 3/6: Any blanky fool who signed on who signed to work for five bob a week should be be blankitty well made to do it, blank him the blanky idiot.
1898		W.A. Sun. Times (Perth) 27 Feb. 3/1: Dash and blank the Exchange! [...] Dash it and blank it, and dash and blank you for a dashed and blanked idiot.
1908		E. Dyson ‘Two Battlers and a Bear’ in Lone Hand (Sydney) June 176/1: ‘Blank me, if it ain’t a blinded bear,’ said Simmons.

2. (Aus.) to curse, to swear at.

1890		H. Lawson ‘Possum’ in Roderick (1967–9) I 81: An’ he only blanked the new chum for a thund’rin’ jumpt-up fool.
1895		J.S. Wood Yale Yarns 65: I cussed and blanked ’em.