Related Clues:

• 'Nuts!'
• 'You gotta be kidding!'
• 'Go ahead and ask'
• 'Horrors!'
• Emphatic denial
• Headliner
• 'Whoops!'
• 'Phooey!'
• 'Yikes!'
• Rubbish
• Cuckoo
• 'Darn!'
• Kooky
• 'It can't be!'
• Gunk