What does y dodne eres mean in spanish?

Dodne eres is meaningles. Donde eres is the way some unfamiliar with the tú form of "to be" would wright "where are you?"

Dónde = Where (use the accent over the O when in a form of a question)

Eres = you are (permenant)

Estás = you are (temporary)

You are never any one place permanently. You are always somewhere temporarily. It may be a long time, but not for ever. So the question should be

¿Dónde estás? Where are you?