Possible Clues:

• 'Yay!'
• "Yippee!"
• Joyful shout
• "Yay!"
• Exclamation that might be followed by 'D'oh!' on 'The Simpsons'
• Excited exclamation
• Exuberant exclamation
• Celebratory outburst
• Celebratory shout
• 'D'oh!' opposite