Related Clues:

• Heckler's holler
• Ghost call
• Spooky sound
• Bleachers sound
• "Eek!" provoker
• Wailing sound
• Manfred Mann's "Do --- Diddy Diddy"
• ''Boo'' follower
• Scary syllable
• ''Bad call, ump!''
• Jeerer's cry
• Response to an error, maybe
• Opposite of "Good job!"
• Bit of heckling
• Follower of yoo or boo