The result of pissing someone off so much that they would take a massive dumb on your eye.
The mass would result in a powerful impact leaving a black eye, the fecal matter would result in an infection such as pink eye, and the fecal residue in your eye would result in a brown eye.
A Brown Eye Back Fire is when you take a dump and when the poop hits the water in the toilet it splashes up on your butthole. It is the most disgusting feeling in the world that everyone you’ve ever met has experienced.