Ball Of Fire [1941]

Sexy, wisecracking nightclub singer Sugarpuss O'Shea is a hot tomato who needs to be kept on ice: mobster boyfriend Joe Lilac is suspected of murder and Sugarpuss' testimony could put him away. Naive Professor Bertram Potts meets Miss O'Shea while researching an article on slang and in true romantic comedy fashion the two worlds collide. When Miss O'Shea hides out with Potts and his fellow professors, everyone learns something new: the professors how to cha-cha and Potts the meaning of "yum-yum"!