A game created at the University of Toronto in the early 2000's. First, a steel door is acquired from a construction site. Then all participants get drunk and try to inflict as much damage upon it with their bodies as possible, often resulting in broken bones. The game has been banned at U of T.
"I spent two hours in the emergency room after last night's game of Steel Door."
This is when two people who love eachother very much decide that they will continue to love eachother while having the experience of kissing other people. (This is sometimes used to test their true emotions / feelings for the other person.) This is most often used in college.