Green’s Dictionary of Slang

an Italian; also as adj.

1939		V. Davis Gentlemen of the Broad Arrows 133: You don’t get any, you spaghetti-eating ice-creamer.
1940		N. Mitford Pigeon Pie 41: There are Chinks and Japs and Fuzzy Wuzzies and Ice Creamers and Dagos, and so on.
1943		R. Llewellyn None But the Lonely Heart 70: Proper funny face he had, and all, real ice creamo, black curly hair. [Ibid.] 254: Rossi was such a quiet, posh sort of a bloke, even if he did talk ice creamo.
1993		(con. 1945) S. McAughtry Touch and Go 11: ‘I was helping the Eyetie air force to re-form,’ I told him. ‘Bunch of bloody ice-cream sellers,’ John growled.