어디야? - where are you? and 어딘데? - where are you? where is it? 1) 어딘데 is a Kyungsang-do dialect. It means 'where are you?' 2) 어딘데 is short for ''어디인데?'' (If a person who speaks stardard Korean says this) it might sound '어딘데?' Situation 1. (Where are you?) A and B are supposed to meet at 1 pm A: I will be late about 30 minutes. B: WHAT? 어디인데? The meeting is very important and about to start in 5 minutes. A : Sorry. I just passed the xx department store. * Please focus on the nuance and tone. Situation 2 (Where is it?) A : I found a nice Korean restaurant. B : 어디인데? A : The opposite of the xxx station.