Green’s Dictionary of Slang

1. (also cutie-poo, cutesy-poo) excessively sweet, cloying, esp. in one’s behaviour.

1947		B. Schulberg Harder They Fall (1971) 186: A little stock-girl with a cutie-pie face.
1976		in R. Yates Easter Parade (2003) 104: The cutesy-poo little bastard with the dimpled chin and the charming wife and the three cutesy-poo little girls.
1978		H. Selby Jr Requiem for a Dream (1987) 12: That cutie pie little boy didnt have any cavities.
1989		A. Sorkin A Few Good Men (1990) 56: Cutie-pie shit’s not gonna win you a place in my heart, Corporal.
1995		J. Stahl Permanent Midnight 309: What makes a soul feel all snuggly and cutesy-poo.
1999		Observer 12 Dec. 15: Not since [...] Godzilla versus The Smog Monster has there been such a battle between two such cutie-pie bruisers.
2000		Guardian G2 7 Mar. 17: Neither cutie-pie innocents nor plastic revolutionaries.
2015		S. King Finders Keepers (2016) 230: There are hundreds of shops with cutie-poo names like Deb and Buckle.

2. usu. of a woman, very pretty.

1970		T. Southern Blue Movie (1974) 13: Les Harrison attempted to intercept her and introduce her to the cutie-pie starlet.
2005		J. Stahl I, Fatty 118: Mabel’s the cutie-pie nurse he flirts with.