Cock-wagon

the equivalent of calling someone a dick and a jack-wagon at the same time; a person who is both ignorant of his environment and still a complete asshole.

Jim: Hey girls, you know I'm the best you'll ever get, and I know you want me, but you know i'm busy tonight, so maybe some other time.
*Jim leaves*

Girl one: Jim lets his ego go to his head, and he's really not that cute at all. AND I'm not interested at all.

Girl two: Yeah, you're right. He's a cock-wagon.