Related Clues:

• ''In your dreams!''
• Word before and after say
• "Forget it!"
• ''No way!''
• ''Forget it!''
• ''Not at all,'' vernacularly
• Dismissive exclamation
• Strong denial
• At all, slangily
• ''When donkeys fly!''
• See 19 Across
• "In a pig's eye!"
• 'Impossible!'
• 'Yeah, that'll happen!'
• ''Don't hold your breath!''