Related Clues:

• Something hysterical
• Cheerleader's routine
• Sotto voce call
• "Excuse me"
• Rock singer?
• Subtler alternative to 'Yo!'
• "Hey you!"
• Clearing, of sorts
• Fire sign?
• 'Hey, buddy'
• Attention-calling marking
• "Excuse me ..."
• Conversation opener
• Sound from an exam cheater
• "Want to hear a secret?"