conehead
1. A stupid person. Did you hear that guy's ridiculous question? Geez, what a conehead. Tony's such a conehead—I can't believe they put him in charge. He's going to run this place into the ground. Geez, he keeps pulling on a door that's clearly marked "push"—what a conehead.
2. Someone who is very intelligent, but with very narrow interests. Smart as he is, I doubt he'll be able to help you change your tire—he's a real conehead. She's a total conehead—can't even boil water but can help you get an A in Latin. I know you coneheads get straight A's, but do you have an ounce of common sense between you? Sheesh.
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