Related Clues:

• Word of approval
• 'Out of sight!'
• Good, at the beach
• 'Terrif!'
• "Far out!" to a physicist?
• 'Totally tubular!'
• 'Terrific!'
• "Nifty!"
• 'Pretty amazing!'
• “Far out!”
• 'Awesome, dude!'
• Tremendous
• 'Sweet!'
• 'Neato!', '90s-style
• 'Far out, dude!'