A friendly farewell amongst headbangers, similar to "have a great day" or "Live long and prosper".
It stems from the concept that if a male were to "bang" (i.e. have sexual intercourse with) someone's head, their balls would be on the person's forehead.
Instead of goodbye to your headbanger friend, say, "Balls on your forehead!"
church hurt is where you experience a degree of distance, pain, or judgement from your church community. Essentially, you are just unable to “find your place”. This is prevalent in the Christian community, but can be extended to other religions.
Now that I am an adult I am beginning to heal from the church hurt that was inflicted on me as a child.