Related Clues:

• 'Ya think?!'
• Play-___ (modeling clay)
• Play-__
• ''It's so obvious!''
• Forehead-slapper's syllable
• '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!''