Related Clues:

• "Awesome!" once
• 'Sick!,' once
• Rock Against Drugs, for short
• "Far out!" in the 1980s
• "That's really cool!"
• "Cool, dude!"
• Wicked cool
• Way cool, in '80s slang
• Quaint 'cool'
• "That's really spiffy!"
• 'That's really spiffy!'
• 'Groovy,' updated
• "Far out!" kin
• 'Coo-oo-ool!'
• Ninja Turtles exclamation