Related Clues:

• Listen!
• Verbal jab in the ribs
• 'You there!'
• "Hey, Mister!"
• Clandestine signal
• Surreptitious sound
• 'Howdy'
• "Hey, Mac!"
• "Howdy!"
• Secretive attention getter
• Fence’s utterance
• 'Wassup?!'
• 'Hey, over here!'
• "Greetings!"
• "Hey there!"