The episode title is a common phrase referring to betraying secrets, especially sexual ones. The idiom comes from the 1695 play Love for Love by William Congreve, with the quote being: “And if he needs must kiss and tell, I’ll kick him headlong into Hell”.
Kiss and Tell is also the name of a 1945 comedy film directed by Richard Wallace and starring Shirley Temple in the lead role of Corliss Archer. It was based on a 1943 Broadway play by F. Hugh Herbert, in turn based on his Corliss Archer short stories; Herbert wrote the screenplay to the film. The movie is about two teenage girls, and the trouble that ensues in their families when they become interested in boys, just as there are ructions when Rory gets a boyfriend.