Related Clues:

• Nifty, in the '50s
• 'Gnarly!'
• "Gnarly!"
• X-ray unit
• Far out!
• "Wow!"
• More than cool
• 90's kids' catchword
• Sterling
• 'Peachy!'
• 'Sounds swell!'
• Exquisite
• "Swell!"
• Very big
• 'Cool'