The inability to finish any type of written communication, i.e. novels, emails, letters, memos, etc...
Todd was in the middle of finishing his next best seller, when his authoritis flared up and caused him to cease writing.
Brook: How is the next novel coming Todd?
Todd: It was going great until my authoritis came back.
Brook: That sucks.
Todd: Tell me about it, this was going to be the best one yet.