An annoying person, usually male, characterized by one or more of a variety of obnoxious traits. These may include but are not limited to arrogance, incompetence, stupidity, an unfounded sense of self-importance, and general disagreeableness. See douchebag.
Mack: Well sonofabitch, here comes that bumbling idiot Todd who thinks he's God's greatest gift to humankind.
Jensen: He's coming this way? Ah fuck. What a royal douche canoe.