A serious talk between two or more people where the person's performance, or attitude, or involvement in the work (or in the relationship) is in need of improving. The talk is meant to save the soul of the receiver so that he or she makes a full change for the better. Often between a person of authority and the subordinates (teacher-student; coach-team), and often uses emotional arguments to get the person to change.
Our professor gave us that come to Jesus talk today. He said we were performing poorly, lacked the right drive to complete the task. He said that he was working hard, trying to make good lesson plans but we were just lazy. The worst part was when he said that he felt that he wasn't a good teacher because we clearly didn't respect him as a teacher.