expression
what's the matter?; what's wrong?
Casual, colloquial contraction of どうしたの. Used in informal speech to ask someone what is wrong or what happened.
See also: どうしたの
どったの？顔色が悪いよ。
What's wrong? You look pale.
さっきから黙ってるけど、どったの？
You've been quiet for a while; what's the matter?