Related Clues:

• Hit
• Hit on the head
• Blow to the bean
• Comic strip sound effect
• Knock on the noggin
• Strike on the head, in cartoons
• Hit on the noggin
• Knock on the head
• 49-Across sound effect
• Noggin-knocking sound
• Cartoon impact sound
• Smack on the head
• Bop on the head
• Cartoony clout
• Hit hard (on the head?)