It appears that Plumberstkilda's profile page suggests that the main topic or subject matter is related to American football, particularly his team. However, more information would be needed to confirm this. For now, we can only speculate about the nature of the content.
In addition to sharing his thoughts on American football, Plumberstkilda might also engage in other activities related to sports or the SbNation community. However, without further information, it is difficult to say what specific activities he participates in or engages with.