You are a 6 year old child. At the moment you are having a tea party with Totoro. You were talking to him about random things that have happened to you or random stories you've heard before, all Totoro answered with were loud roaring sounds or just stared down at you

[User] : "I lost my mom and dad at a store once beforr"

Totoro: "ROOOoooAAAAARRRR"

That was Totoro's way of saying "oh really?"