Related Clues:

• Word accompanying a head-slap
• Homer's "Stupid me!"
• 'Yeah, no kidding!'
• "I can't believe I missed that!"
• Word heard by Marge a lot, I imagine
• Homeric exclamation?
• 'How stupid am I!'
• 'What else could it be?!'
• Exclamation from Homer
• 'That's, like, preschool level'
• Homeric outburst
• Sound made by Homer Simpson
• Cartoon catchphrase included in the New Oxford Dictionary of English when it was first published in 1998
• Homer outcry
• Word with a Homer head-slap