A person who goes to college and loves it so much that they find themselves unable to return to the real world, and remain living at or around their college forever.
"Oh he's cute I wonder what year he is"
"Oh that's Garrett, he graduated like 6 years ago"
"What! I had no idea he was a failure to launch"
"Yeah I guess he just wasn't ready for the harsh reality of the world outside Example University."