OOC attacks refer to nations that resort to hostile actions out of the bounds of CN in order to "attack" TDP ie. deleting forums, impersonating leaders, ect. These types of attacks are consider especially inappropriate and while we would prefer to avoid having to PZI someone; it is incredibly appropriate should their actions threaten the safety and security of TDP.
While it is not a decision we will take lightly; it is not one we will ignore should the situation arise.
edit: clarifying details