Related Clues:

• Nifty, in the 50's
• Slangy approval
• Peachy-keen
• Spiffy
• 'Far out!'
• Marvy
• 'Cool!'
• Cool
• 'Goody!'
• 'Awesome!'
• Cool, once
• Groovy
• 'Outta sight!'
• Just ducky
• Swell