Related Clues:

• Jeer
• Stadium sound
• Bird call
• Holler's partner
• Reaction on a roller coaster
• Riot
• Attention-getter
• Hoot
• Blast
• Sound of disapproval
• Least bit of concern
• Cry
• Knee-slapper
• What 69-Across will grow up to do
• Rib-tickler