Related Clues:

• 'I goofed!'
• Exclamation written in scripts as '(annoyed grunt)'
• Head-slapping word
• ''How stupid of me!''
• Homer Simpson epithet
• 'It's so obvious!'
• "No __!"
• 'Obviously, Einstein!'
• Homer's outcry
• 'What a moron I am!'
• 'Ya think?!'
• Play-___ (modeling clay)
• Play-__
• ''It's so obvious!''
• Forehead-slapper's syllable