Possible Clues:

• Eye-roller's reply
• "Yeah, what-evs"
• ''Don't make me laugh''
• Sarcastic 'Sure you can!'
• "That's doubtful"
• 'Yeah, right ...'
• Skeptic's rejoinder
• ''My eye!''
• 'Uh-huh, yeah, sure'
• ''Yeah, sure''