Related Clues:

• "Sweet!"
• Meathead
• Hardly a Mensa candidate
• Inside information
• Inside stuff
• Dull-witted one
• Noodlehead
• Yo-yo
• Stupid person
• Like osmium, more than any other known element
• Hard to penetrate
• Bozo
• Crammed
• Needs another way?
• Moron