When you stand in between two people. to stop a verbal conflict from happening, you become a UN-Border-Zone.
Or
When you are placed or placed by yourself between to people to stop sexual arousal from happening between a couple or a potential couple.
Will had to act as a UN-Border-Zone between George and Evie.
When you're playing a video game then a bullshit glitch or general bad coding stops you from beating it.
John:"What Bullshit! He just shot through a bulletproof wall!"
James: "Jees, that fifa'd"