Literally means "Third Degree Burns." In our case, when a teacher named Mr. Burns verbally burns a student, usually resulting in the utter humiliation of the student.
Mr. Burns:"News! What's Happenin?"
Student wearing fruity clothes:"Mr. Burns, there was a gay pride parade over the weekend."
Mr. Burns:"Really? Did you just come back from it?"
Student #2:"Oh shit. You just got TDBurned."