Related Clues:

• Outburst accompanying a facepalm
• Homer's "Heck!"
• 'Yeah, that's what they all say. They all say ___': Chief Wiggum
• "How could I not see that?!"
• Shout on 'The Simpsons'
• Cry made with a head slap
• First note in sol-fa
• Homer's head-slapping cry
• Comment from Homer Simpson
• 'Why did I do that?!'
• Word accompanying a head-slap
• Homer's "Stupid me!"
• Word heard by Marge a lot, I imagine
• Homeric exclamation?
• 'How stupid am I!'