Related Clues:

• 'Yay, yay!'
• A word for our side
• Jubilant shout
• 'Yahoo!'
• 'Wahoo!'
• "Hip hip" follower
• 'Joy!'
• Joyous shout
• "I'm so glad!"
• 'Let's get milkshakes!' response
• "Let's get milkshakes!" response
• "School's out" response
• Exultant yell
• Follower of a pair of hips?
• "Hurray!"