Dreams involving conflict, violence, or betrayal can often be a reflection of underlying emotions or tensions in your waking life. Here are a few potential interpretations of your dream:

1. Conflict and Tension: The dream may symbolize unresolved issues or conflicts among your friends or within your social circle. The act of your homeboy getting mad could represent feelings of frustration or anger that you've observed or experienced yourself.
2. Fear of Betrayal: The tattooing process in your dream might symbolize a commitment or bond. When your homeboy reacts negatively, it could indicate a fear of betraying or losing those bonds, or it could reflect concerns about loyalty among friends.
3. Power Dynamics: The violent escalation in the dream, including the shooting and the eventual killing, might suggest feelings of powerlessness or a desire to take control in a situation where you feel threatened or vulnerable.
4. Emotional Release: Dreams that involve violence can sometimes be a way for the subconscious to release pent-up emotions such as anger, frustration, or stress. This dream may be a manifestation of those feelings.

To better understand the meaning of your dream, consider reflecting on your current relationships and any recent events that may have triggered these emotions. It might also be helpful to discuss any tensions with your friends openly to avoid misunderstandings.