An overly cocky asshat. MK is an abbreviation, which is most commonly used. Originated from an internet user's name who was such an overly cocky asshat that his name started to become an insult on the site he went to.
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.