The term 'Bueller' is a reference to the 1986 movie 'Ferris Bueller's Day Off'. The character of Ferris Bueller was played by actor Matthew Broderick. In the movie, Ferris Bueller skips school and goes on a wild adventure with his best friend Cameron Frye and girlfriend Sloane Peterson. The movie is a classic coming-of-age comedy that has become a cult classic. The term 'Bueller' is often used as a reference to the movie and its main character.