THe nasty build up of sweat and fungus when someone doesn't wash there grundle

Someone who is possessed by clout chasing. The original human is now gone and a demonic entity that feeds on clout is all that is left. An empty shell with no control of their actions, forced to blindly react to situations they think will bring them attention.

The moldy orange stuff Bill takes off Newman's grundle and puts on his ham sandwiches. It smells like rotten cheddar mixed with ear crust but Bill still eats it.