Related Clues:

• Yup's alternative
• 'Yeah, right!'
• Informal denial
• Slangy refusal
• Slangy turndown
• 'Forget it!'
• 'Don't think so'
• 'Oh, sure!'
• Slangy denial
• 'Uh-uh'
• 'Don't sweat it'
• 'Nope'
• Rebuttal to 24-Across
• Down-home turndown
• 'No dice'