Related Clues:

• "Groovy!"
• "Cool, dude!"
• "Coolio!"
• Cool, in the '90s
• Most of those in 27 down, of course
• 'Cool,' in dated slang
• "Cool," in dated slang
• Modern communication needs a new start? Humbug!
• Geiger counter unit
• "Groovy," in the '80s
• Romantic words with love hearts, say, inspiring love
• Trigonometry meas
• “Far out!” in dated slang
• Unit akin to the roentgen
• "Super cool"