Related Clues:

• When doubled, start of a cheer
• "Sweet!"
• Cooler than cool
• Swell, '90s-style
• 'I'm ___'
• "Awesome!"
• X-ray dose
• Physicist's unit
• Gnarly
• When repeated, start of a cheer
• "Groovy!"
• Sound repeated while marching
• 'Gnarly!'
• "Gnarly!"
• Like jazz cats