Related Clues:

• La la lead-in
• ''--- whillikers!''
• 'Nifty!'
• Cry at a circus
• 'That's really something!'
• Sound of contentment
• 'What a surprise!'
• 'How exciting!'
• Well follower
• 'Mercy!'
• Word of wonder
• 'Cool, man!'
• "Cool!" old-style
• Beaver exclamation?
• Words before a monkey's uncle