DUMO

Someone behaving in a unintelligent manner. Example: Chris is not only a bully, he's also a dumo! He tries to show how tough he is by beating up on people who are smaller than he is and have no interest in fighting. He thinks that makes him tough? How stupid can he be? It just shows that he's an extremely poor sport and a bully. No way would he ever take on another third-degree black belt who was his own age and bigger and stronger and faster. Well, hehe, I guess that'd just show that he was dumo, too. He's hopeless.