'C U Next Tuesday/Thursday'
Early on in film, Judy's character is giving Gene's character a hard time and, as he leaves kitchen, he makes the remark, smirking, "See you next Thursday." The remark is utterly meaningless. . .until you realize that it was once a coded way to indicate that person is insulting person he/she is speaking to by suggesting initials are a vulgar term for female genitalia.
Undoubtedly an in-joke vulgarity that flew over heads of most people (and censors) but turns up in other movies, too, including heated exchange in What Ever Happened To Baby Jane? when "See you next Tuesday" inexplicably crops up in angry conversation between Jane and maid for no other clear reason. (Why not Monday, Wednesday, Friday or simply "next week"?)