Related Clues:

• 'So cool!'
• Eng. cooler
• "Excellent!"
• X-ray dose unit
• 'Far out, man'
• 'Killer, dude!'
• ''Neat-o!''
• Totally dope
• ''Terrific,'' in '80s slang
• Awesome, in surf talk
• Totally cool, in '90s slang
• Unit of radiation
• 'Kewl!'
• Totally cool
• 'Super cool!'