Related Clues:

• 'Dumb, dumb, dumb!'
• Cartoon word said while wincing
• 'Dang it!'
• Exclamation from a blockhead
• 'Am I an idiot!'
• Bart Simpson hears it a lot
• Homer Simpson utterance
• 'Any idiot knows that!'
• Noted cartoon catchphrase
• ''Boy, am I stupid!''
• "Silly me!"
• 'Well, that's obvious'
• 'Gee, ya think?'
• "What an idiot I am!"
• "Obviously!"