Duh / Doh

Duh (ダー）: 当たり前じゃん、何いってるの　you are stupid　（皮肉る感じ）

Doh（ドー) : I’m stupid :語源はシンプソンズ

i.g.

A: Are you going to the party tonight?
B: Duh!

Reference source

https://www.design-bizenglish.tech/entry/duh-in-english-meaning