Related Clues:

• Pun reaction
• "That smarts!"
• Piercing cry?
• Comic-strip cry of pain
• Audible reaction to a punch
• Punch line
• [That punch hurt!]
• Socked-in-the-gut sound
• Sock-in-the-gut response
• Reaction to a slug
• Response to ''Pow!''
• Heating bill reaction?
• Belt reaction
• 'Man, that hurts!'
• Response to a wedgie, perhaps