The correct answer is “Kyke”.
The derogatory term does Mrs. McKee used to describe the man she almost married is Kyke.
In chapter two of the book “The Great Gatsby”, there is a discussion on why Myrtle is married to her husband. Then Mrs. McKee commented that she almost married a little Kyke who had been after her for years. Mrs. Myrtle also added that she knew he was below her. The word “kyke” is used as a derogatory term to refer to Jews. People believe the word originated in the 19th century when Jews from Europe emigrated to the United States and arrived at Ellis Island, New York. Jews preferred to sign with an “O”, instead of an “x”, for the Christian connotation. In the old Jewish language called Yiddish, the word for “O” is kyke. And the authorities from U.S. immigration called Kykes to the Jews that signed papers with an “O”.