Related Clues:

• Playground retort
• 'Just watch me!'
• Response to a naysayer
• Playground rejoinder
• 'Most definitely!'
• Playground rebuttal
• Rejoinder to a doubter
• Playground affirmation
• "Wanna bet?"
• Comeback to a skeptic
• Answer to 'No, that's not!'
• Insistent affirmation
• Reply to 'No way!'
• "Most certainly!"
• "Just watch me!"