Related Clues:
- Word meant to startle
- Response that, odds are, I'm probably going to get
- Vocalize displeasure
- "Boo" accompaniment
- Spectral cry
- Partner of 20-Across
- "Eek!" elicitor
- Asp's greeting
- "Boo" follower
- React to an umpire's bad call
- Cry of disapproval
- [I can't believe you just stepped on my tail. Now back the fuck away.]
- Snake's noise
- Verbalized displeasure
- Ghostly cry