Fungool (or fangool) is a mispronounced and anglicized version of the Italian phrase va’ fa’ in culo, which translates to “go fuck yourself” in English.
The phrase va’ fa’ in culo literally means “go do [something] in the ass” and is a common Italian curse used to express anger, frustration, or dismissal. In Italian-American slang, it has been softened and adapted into fungool or fangool, particularly in casual or colloquial settings. Over time, the pronunciation and spelling have evolved among Italian-American communities.
While fungool is often used in a lighter, sometimes joking context, it’s still considered offensive, so it should be used with caution depending on the situation.