Green’s Dictionary of Slang

1. (orig. Aus./N.Z.) a French person.

1845		E.J. Wakefield Adventure in N.Z. I 94: If I had sold the land to the white missionaries, might they not have sold it again to the Wiwi (Frenchmen) or Americans?
1848		in J. Leyda Melville Log (1951) 281: There was also a diminutive young ‘oui oui’ tumbling about the floor.
1852		G.C. Mundy Our Antipodes II 380: Like the ‘Wi-wis’ of Young France.
1857		C.F. Hursthouse N.Z., the Britain of the South i 14: De Surville’s painful mode of revenge [...] rendered the wee-wees (Oui, oui), or people of the tribe of Marion, hateful to the New Zealanders for the next half-century.
1859		A.S. Thomson Story of N.Z. i 236: Before the wewis, as the French are now called, departed.
1873		H. Carleton Life of Henry Williams 92: The arrival of a French man-of-war was a sensational event to the natives, who had always held the Oui-oui’s in dislike.
1881		Percy Pomo 207: Has [sic] the weewees puts it.
1897		J.D.J. Kelley Ships Company 137: The ‘oui-ouis,’ as the French were contemptuously called [HDAS].

2. the French language.

1905

‘Doss Chiderdoss’ ‘A Polyglot Policeman’ Sporting Times 1 Apr. 1/4: There’s the parlour-maid at number six, a tasty joint from France, / We were pals because a few ‘wee wee’s’ I slung.

3. France.

1886

Daily News 20 Oct. in Ware (1909) 260/1: This looks very much as if the English race were dwindling into a people of town-loafers, afraid to risk themselves in new enterprises in rude lands, and as incapable of being genuine colonists as the despised ‘men of Wee Wee.’.