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게 뭔데

what is ...?

→ 것+이
phrase Uncommon #14,539
what is ...? 게 is a shortened form of 것이, meaning “the thing that” or “what.” The phrase can sound blunt or confrontational depending on context.
KO: 네가 원하는 게 뭔데?
EN: What is it that you want?

특별한 게 뭔데?

What's so special?

— 저수지의 개들 (1992)

레이철은 가진 게 뭔데?

What does Rachel have?

— 크레이지 리치 아시안 (2018)