Related Clues:

• 'Dream on!'
• 'Sorry, Charlie!'
• ''As if!''
• Unequivocal refusal
• ''In your dreams!''
• ''Uh-uh!''
• "Forget it!"
• "Ain't happenin'"
• "Impossible!"
• ''Forget it!''
• ''Not at all,'' vernacularly
• Dismissive exclamation
• At all, slangily
• Response to unwanted gossip, perhaps
• "You can't be serious!"