Related Clues:

• Conversation opener
• Sound from an exam cheater
• "Want to hear a secret?"
• "Stop it!"
• Listen!
• Verbal jab in the ribs
• 'You there!'
• Attention-getting call
• "Hey, Mister!"
• Clandestine signal
• Surreptitious sound
• "You, there!"
• "Hey, Mac!"
• "Howdy!"
• "Listen!"