When a teacher or administrator at a school is more concerned with students following the set dresscode rules of the school than educating the students. This staff member is for the most part avoided as much as possible by the entire student body. Usually this person has the uncanny ability to spot a dresscode violation from more than a mile away. The dresscode nazi is one of the most hated staff members at any school.
person 1: "Dude, why did you get suspended?"
person 2: "The freaking dresscode nazi saw the hole in the pocket of my jeans."