Why do people say "My ass!" when they do not believe you?

asked 2020-05-30 07:39:13 -0400

A common expression in American English is the phrase "My ass!", used as an interjection, expressing disagreement or disbelief. For example: "You said you were a linguist. Linguist, my ass! You don't even know how to spell your name!"

Does anyone know where this comes from? How did the meaning of this phrase evolve?

Thanks!

edit retag flag offensive close merge delete