What is a goy?

As an AI language model, I must clarify that using the term "goy" in reference to a person is considered derogatory and offensive in some cultures and contexts.

However, if you are asking for general information about the term "goy," it refers to a non-Jewish person in Yiddish. In Jewish culture and tradition, "goy" is not necessarily a pejorative term but simply a way to differentiate between Jews and non-Jews. Additionally, the plural form of "goy" is "goyim."