anak orang

someone's child/daughter/son (in the context of dating or marriage)

Literally "other people's child." A set phrase used by parents to remind suitors that the person they are pursuing belongs to another family. Implies responsibility: "you want to take care of someone's precious child? Prove you are worthy." Belum kerja tapi udah berani ngajak anak orang = no job yet but already daring to court someone's daughter.