Mao

-An exclamation made as a response when someone tells you to do something you don't want to do but know you should.

-A way to express stubbornness or a spirited nature in a playfully oppositional way.

-Inspired by the sound a cat makes when either annoyed or annoying others.

Person A: I'm really tired.

Person B: Go to sleep!
Person A: Mao!