Possible Clues:

• Sarcastically enthusiastic response
• Sarcastic 'I'm thrilled'
• Insincere ''Hurray!''
• Mock expression of delight
• Sarcastic “Great!”
• 'How great,' sarcastically
• 'How wonderful!,' sarcastically
• Cry of mock enthusiasm
• Catchphrase for Stimpy
• 'That's great ... not!'