Related Clues:

• Emphatic denial
• Haughty refusal
• 'Yippee!'
• 'When pigs fly!'
• 'Forget it!'
• Not at all
• 'Hooray!'
• 'Well, I ___!'
• 'Hurray!'
• 'Over my dead body!'
• 'Fat chance!'
• 'Hurrah!'
• 'Yay!'
• When hell freezes over
• Defiant reply