evil boy genius 

A young male, generally from pre-pubescent to adolescent stage, who displays exceptional intelligence and/or handiness with electronics and science. This is the most common type of young genius and is distinguished by using their inventions, usually death rays or attack robots, for wrongdoing.

That evil boy genius just had one of his robots steal my grilled cheese!

evil boy genius by 'Annony' June 7, 2005