Green’s Dictionary of Slang

sexy, racy; the implication is of stereotyped French sexuality, usu. describing a woman.

1961		Life 20 Oct. 29: Le Crazy Horse, where the show is full of moderately entertaining synthetic ooh-la-la girls.
1967		S. Novo New Mexican Grandeur 47: The dazzling installation of a catwalk where the brisk ‘ooh-la-la’ girls paraded and shook their blond flesh.
1994		(con. 1940s) G.W. Mark Hollywood Cauldron 216: The ooh-la-la legend and lore of Simone Simon [...] her bedroom eyes, pouty mouth, and baby-talk voice.
2001		Guardian 5 Oct. 🌐 Harvey Weinstein clearly thinks he has found in Tautou the ooh-la-la box office magic that Juliette Binoche gave him in Chocolat.
2002		C.N. Douglas Cat in a Leopard Spot 48: The ooh-la-la lady magician who is one nice plate of chop suey in the looks department.
2008		H. Kaiser French War Brides 155: The attitudes and behaviors of the vast majority of the women I interviewed certainly belies the American stereotype of sensual ‘ooh-la-la girl’.