Related Clues:

• Vocal thumbs down
• Sign of a leak
• Scary syllable
• Be sour
• ''Bad call, ump!''
• Jeerer's cry
• Response to an error, maybe
• Opposite of "Good job!"
• Sulk in silence
• Bit of heckling
• Simper
• Greet the visiting team
• Greet uncivilly
• Raspberry's cousin
• "You suck!"