금시초문이 · 금시초문을 (often 금시초문이에요)
news to me; hearing something for the first time
Example
그 사람이 결혼했다고요? 저는 금시초문이에요.
He got married? That's news to me.
Word parts
금 now+시 begin+초 first+문 hear
Literally 'only now hearing it for the first time'.
Related words