Possible Clues:

• North-of-the-border boor
• Canadian bozo
• Car wash employee, at times
• Canadian for dunce, dweeb or dolt
• Idiot, in Canadian lingo
• Canadian blockhead
• Canadian chowderhead
• 'The Great White North' insult
• One washing down a driveway, e.g.
• Canadian slang for loser that's also one letter away from 'loser' and 'poser'