So when Justin and Cooper are standing outside of June Clark's house, Justin says to Columbo

"The campus hotline knows where they used to hang out."

What exactly is a campus hotline? I think Justin WAS the campus hotline. We certainly didn't have anything like that when I went to college

There is no official "campus hotline". He's probably talking about the gossip that goes on at the school. And yes, Justin seems to be like the gossip guy.