Related Clues:

• Marv's relative?
• Awesome relative
• "Keen!"
• Retro ''Way cool!''
• "How nifty!"
• 'How nifty!'
• The earliest known printing of this US slang term for “excellent” was in 1951
• "How cool"
• "Super cool"
• "Gee whiz, that's cool!"
• “Peachy!”
• "How groovy"
• Pretty rad
• "Cool beans"
• "Groovy"