Related Clues:

• Response to dropping donuts and so forth
• 2001 OED addition that cites "The Simpsons"
• "Am I an idiot!"
• Word spoken with a head slap
• 'Oh, of course!'
• Homer holler
• Cry accompanying a head slap
• "How could I miss that?!"
• "Everybody knows that!"
• ''I shoulda known that''
• Homer Simpson's cry
• ''I should have known that!''
• "Okay, I get it already"
• Word from Homer Simpson
• ''Simpsons'' exclamation