Related Clues:
- Show displeasure
- Pressure cooker sound
- Vocal thumbs down
- Sign of a leak
- Air leak sound
- Unwelcome boarding-pass marking
- Deflation indication
- Unwelcome sound to a driver
- Boo accompanier
- Alarming sound for a hot air balloonist
- Theater jeer
- Boo companion
- Moccasin sound
- Sign of an escape?
- Leaky radiator noise