Related Clues:

• Sound of crowd disapproval
• "Boo" accompaniment
• Radio broadcast interference
• Asp's greeting
• "Boo" follower
• Critical comments
• Shocking buildup?
• [I can't believe you just stepped on my tail. Now back the fuck away.]
• Snake's noise
• Sign of bad reception
• Unwelcome reception
• Sibilant threat
• Sound of displeasure
• Sign of a bad connection
• *Let off some steam?