Related Clues:

• Sound of amazement
• 'Isn't that pretty!'
• How Scotch may be served
• Fireworks sound
• "Amazing!"
• Awesome!
• Expression of disbelief
• Felix Unger-esque
• Backup singer's syllable
• Awed one's reaction
• Impressive
• "Holy cow!"
• ''__ la la!''
• Tremendous
• 'Sweet!'