Related Clues:

• 'Gnarly!'
• "Gnarly!"
• X-ray unit
• Far out!
• "Wow!"
• More than cool
• 90's kids' catchword
• 'Peachy!'
• 'Sounds swell!'
• "Swell!"
• 'Cool'
• Unit of 100 ergs per gram
• Word of approval
• 'Out of sight!'
• Good, at the beach