"Pardon My French" is an idiomatic expression used in English to apologize for using profanity or offensive language. It often precedes or follows a curse word, signaling that the speaker is aware of the inappropriateness of their language but feels compelled to express themselves that way. The phrase has its origins in the 19th century when English speakers would use French phrases to sound more sophisticated. Over time, it evolved to indicate that the speaker is aware of their language's rudeness, similar to how one might excuse themselves for a slip of manners.