Here's a breakdown:
* Que pasa: This is a common way of saying "What's up" or "What's happening".
* Mija: This is a term of endearment, similar to "honey", "sweetheart", or "dear" in English. It's usually used by older women toward younger women, often daughters, nieces, or close friends.
Therefore, "Que pasa mija" is a friendly and affectionate way to say "Hello" or "How are you?" to a woman someone is close to.