Related Clues:

• 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
• Hit sign?
• Sound of pain
• "Yeow!"
• Punch-in-the-gut response
• [My gut!]
• Cut line?
• Hit-in-the-solar-plexus noise