Back in the days of Howdy Doody and the Cleavers, it was the nickname you to avoided at all costs.
Knucklehead.
Chris Cooley wasn't even around then, but he's aware it's not used to describe the sharpest knife in the drawer. Nonetheless, the Washington Redskins' second-year offensive jack of all trades loves it.
http://www.roanoke.com/sports/profoo...wb/wb/xp-37544