pencil friend
someone you know in a class that you'd feel comfortable enough to ask if you could borrow a pencil (paper, calculator, etc), but not enough to hang out with outside of class
person: "I met this really nice girl in my chem class last week, we sit together like every day!"
roommate: "Cool, you should invite her over sometime."
person: "No no..she's strictly a pencil friend."
roommate: "Cool, you should invite her over sometime."
person: "No no..she's strictly a pencil friend."