Related Clues:

• Snake sounds
• Moves serpentinely
• Serpent's warnings
• Moves like a lizard
• Audio problems
• Greets the villain
• Shows disapproval
• Angry cat sounds
• Radiator output
• Leak indicators, perhaps
• Sounds like thisss
• Signs of audience disapproval
• Makes moccasin tracks
• Sibilant catcalls
• Bad sounds from the house