madlad

Someone (either male or of unspecified gender) who does something particularly impressive and audacious.

Coordinate term: madlady

Some madlad hacked the school website to give everyone an extra day off.

Alternative form of mad lad (“a young man who engages in dangerous behaviour”).

Sleipnir noticed the direction of Agatha's gaze. "Those are Radioheads," she whispered. "The Baron acquired them from some madlad he had to put down in Albania a few years ago. He figured if he could build fighters without brains, they wouldn't get scared or feel pain or worry about dyin'. The Baron doesn't use them off the Castle, because they creep people out too much."