Separation Stall

In the men's bathroom, a urinal left empty between two men so as to prevent the increase of awkwardness

Steve - "You know what a separation stall is, right?"

Rob - "Yeah. Why?"

Steve - "Well, I was using a urinal with no one else in the bathroom when another man came in and used the stall right next to me. He totally forgot a separation stall"

Rob - "Ouch."