Related Clues:

• Slap-on-the-head cry
• Homeric outburst?
• "I'm such an idiot!"
• Cry with a head slap
• Christian dropping right in it? What a plonker!
• Simpson's interjection
• Homer Simpson's contribution to the OED
• Slap-on-the-forehead cry
• 'I blew it,' to Homer
• First note in sol-fa scale
• Sound trademark of 20th Century Fox
• "I blew it," to Homer
• 'I'm an idiot!'
• Homer says it a lot
• Mensa member's opposite