Related Clues:

• 'Unbelievable!'
• "Gnarly!"
• 'Nice!'
• Gasp of delight
• "Oh wow!"
• "Holy smokes!"
• Reaction to fireworks
• X-ray unit
• Far out!
• "Wow!"
• More than cool
• Delighted exclamation
• "Golly!"
• Bang-up
• 90's kids' catchword