stall brother
A person who enters and occupies a public restroom stall adjacent to a stall that is already occupied despite the fact that there were other stalls available that would have allowed a buffer, negatively affecting the enjoyment of your activity. An offense similar to occupying the middle urinal.
I went to take a dump at the mall and had the whole bathroom to myself! Then just as I get ready to go, some asshole walks in and takes the stall next to me. I said ‘Dude, can you take the next one down? I don’t want to be stall brothers’.