look up any word, like hipster:
 
1.
When you're friends with someone in one of your classes, but outside of that class they treat you like a stranger.
"She and I have such a classroom friendship. When I say hey at lunch, she acts like she doesn't know me, even though we were cracking up during a World History lecture an hour ago."
by Hassan & Fei-Yen June 11, 2013