Related Clues:

• Emphatic affirmative
• 'Boy, am I stupid!'
• Simpleton's utterance
• 'You betcha!'
• Sarcastic response
• 'Of course!'
• Comment made while slapping the forehead
• 'Like, I get it'
• Self-deprecating utterance
• 'How stupid of me!'
• 'Of course'
• 'Without a doubt!'
• 'How could I be so dumb?'
• 'Absolutely!'
• 'What a dope!'