Related Clues:

• Whack
• [Just like that!]
• Hammer sound
• [all of a sudden!]
• Wallop
• Sound of impact
• 'Kapow!'
• Sound of a punch
• Mah-jongg piece
• 'Pow!'
• Comic book punch sound
• Impact sound
• 'Batman' sound effect
• Hit hard
• Big hit in the comics