Adonde vas despues de comer?

Answer 1

Do not forget punctuation mark.
¿A dónde vas después de comer?

but, what is your question?

Answer 2

You might be wondering how to reply to this question, or what it even means...

A donde vas a comer - Where are you going to eat?

Here are some answers:

Voy a comer en la cafeteria.
Voy a comer al restaurante.