Green’s Dictionary of Slang

1. (US) a fool, an unsophisticated person.

1920		Advocate (Burnie, Tas.) 5 June 7/2: Don’t stand there like a blinkin’ shell-shocked kewpie.
1925		Dos Passos Manhattan Transfer 389: I thought that you was a dead game sport and not a kewpie above the ears like most of ’em.
1967		I. Rosenthal Sheeper 47: Peter is all golden – all sweet is golden, this pot fact is transcendental, all you kewpies who think sweet is silver open your eyes.

2. (US Und.) a child.

1929		C.G. Givens ‘Chatter of Guns’ in Sat. Eve. Post 13 Apr.; list extracted in AS VI:2 (1930) 133: kewpie, n. Infant.
1949		Monteleone Criminal Sl. (rev. edn).

3. (Aus.) a prostitute [rhy. sl. = moll n. (2)].

1984

A. Delbridge Aussie Talk.