A girl within a certain group of people (such as a high schoolclass) who is known for administering blow jobs and/or other sexual favors. The term is a play on words, leading one to believe it is referring to the academic superior of a class.
Guy 1: "Man, Katie is such a bitch!"
Guy 2: "Yeah, she's the head of the class."
1. a: To assume an exclusive role of leadership in an environment of ostensible equality or diversity. b: To make one's voice or opinion the only option.
2. To carry such a commanding presence due to an overbearing personality or charisma that inevitably overshadows that of anyone else, even those of greater importance.
1. You have made it clear that in this plenum you sit at the head of the round table.
2. A man of great stature whose very entrance to a room cast an air of authority and a demand for respect and awe, beaming in charisma and exuding confidence, it is clear that he takes his seat at the head of the round table.