何様だ

who do you think you are?

→ 何様
phrase Rare #40,436
who do you think you are? A confrontational, often rude expression questioning someone's authority or attitude. The longer form 何様だと思ってるんだ means “who do you think you are?”
JA: そんな偉そうな態度を取って、何様だ?
EN: Who do you think you are, acting so superior?

何度でも言う何様だ偉そうに

I’ll say it as many times as it takes: who do you think you are, acting so high and mighty?

— ベイビー・ブローカー (2022)

何様だと思ってるんだ

Who the hell do you think you are?

何様だ

Who do you think you are?

— RRR (2022)

何様だ聞いてる

I'm asking who the hell you think you are.

— 不思議惑星キン・ザ・ザ (1986)