It's "Miss" YKTTW Discussion
When a man and woman meet, he calls her "Missus" and she corrects him with "Miss."
Unlike other tropes having to do with forms of address, this trope is always used to foreshadow romance between the man and the woman. It's a way for the woman to let the man know she's single, or at least unmarried. It's a simple exchange but is almost the same in all the works it appears in. The only occurrence I can think of off the top of my head is one in Drillbit Taylor.