Related Clues:

• Kapow!
• Strike
• Thriving time
• [Just like that!]
• Hammer sound
• [all of a sudden!]
• Quite a thrill
• Thrill
• !, to a printer
• Sound of impact
• Report of a shooting?
• 'Kapow!'
• Gun sound
• [Sans warning!]
• Mah-jongg piece