A fictional stalker on a social networking site. This person never reveals their their identity to their victim. Chank is usually created by close friends who know more than the average person would know about the victim, therefor leaving the victim very confused and paranoid.
Chris and Tim decided to chank me. Couldn't believe it was them all along. Why would they waste their time?
Tom got so worried about the mysterious Chank, he wouldn't step foot in his basement for days.