Actually جُوُز مِنْهُم is an Iraqi term, specifically from Baghdad and it means:
Leave them and stay away from them.
In this song, the singer says: leave them and don't blame them, just stay away from them, because they broke their promises. How did they abandoned us with no excuse!
جوز منهم لا تعاتبهم بعد جوز
شلك عدهم ناس ما الهم عهد جوز
شلون جازونة بهجر و بلا عذر
تالي باعونة بسعر ماينذكر
وهاي هم قسمة ووعد جوز منهم
This is a tough song Claudia, I'm impressed that you are trying to understand its meanings :)