갑자기왜 /gap-ja-gi-we/
Why suddenly? / Where did that come from?
Used when something comes completely out of nowhere. Expresses confusion or surprise at an unexpected statement or change in topic.
Examples
갑자기왜 그런 말을 해?
Why are you suddenly bringing that up?
갑자기왜ㅋㅋㅋ 뭔 소리야
Where did that come from lol, what are you on about