Related Clues:

• "How stupid of me!"
• 'Simpsons' word added to the OED
• Dropped-donut reaction for Homer
• "Simpsons" word added to the OED
• 'Boy, am I an idiot!'
• "Well ___-di-dah!"
• "___-di-dah!"
• Head-slapper's cry
• 'I am an idiot!'
• "I'm such a klutz!"
• Play-___ (kids' art medium)
• 'Well, ___-di- dah!'
• Exclamation popularized by “The Simpsons”
• It's listed as "(annoyed grunt)" in "The Simpsons" scripts
• Play-___ (kid's clay)