A type of Facebook group, originating at the University of Western Ontario in Canada, in which people post things (stupid, embarrassing, or sexual) that they have "overheard" on school/campus grounds.
Groups include titles like "Overheard at Fanshawe College" etc.
Guy 1: Man I've been saying stupid shit all day so that I could get on overheard.
Guy 2: Shut up. You're annoying.