Related Clues:

• Kewl
• 'Awesome!' in old slang
• X-raying unit
• Neato kin, later
• Cool kin
• 'Coolio, daddy-o!'
• 'Pretty slick!'
• Impressively tough, slangily
• 'Aw gee, that's peachy keen!'
• Total baller
• Retro-remarkable
• Cool, retro
• "Far out," later
• Robotics company with a ''swell'' name
• 'Sick, dude!'