Related Clues:

• Emphatic denial
• Yup's alternative
• 'That's a lie!'
• Informal denial
• Slangy refusal
• Haughty refusal
• 'When pigs fly!'
• Slangy turndown
• 'Forget it!'
• 'Don't think so'
• Not at all
• 'No way!'
• 'Huh-uh'
• Nah
• 'Well, I ___!'