1. An otherwise competent creative professional working outside scope of competence, often resulting in substandard execution or management of a project.
2. Any creative professional, or one aspiring to be, who behaves pretentiously.
Never assign a duhsigner to build software or user interfaces, it's an engineer's job.
That architect never before built anything bigger than a museum installation, now the duhsigner thinks he's going to craft the tallest having in the western hemisphere?
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).