Shiksa (plural shiksas) is a Yiddish word that is an extremely derogatory pejorative used to insult white gentile women. It's definition varies depending on who you ask, but it can mean whore, cow or some other "unclean" animal. It and the other jewish racial slur goyim are as derogatory as the word "nigger", however Jews are able to use shiksa and goy all the time without consequence.
- A gentile girl or woman, especially one who has attracted a Jewish man. The term derives from the Hebrew word "sheketz", meaning the flesh of an animal deemed taboo by the Torah. Since a Jewish man marrying a non-Jewish woman is taboo also, this word applies to her. [...] The ideal shiksa is a blonde WASP who look like the opposite of a stereotypical Jew, but in reality, many shiksas are brunettes who might pass for Jewish themselves.
- shiksa, urbandictionary.com