At Texas Christian University, the way of defining a relationship that happens between a boy and girl. The somewhere in between just fucking to being facebook official. Many people know that these two people are hooking up but that its a little more involved.
Girl 1: "Who was that guy you were with last night, I've seen him with you a couple times, are you guys dating?"
Girl 2: "Oh no were not together, we're just TCUing"