Related Clues:

• "Hey, Mac!"
• "Howdy!"
• "Listen!"
• Secretive attention getter
• Fence’s utterance
• 'Hey, over here!'
• Word of greeting
• Tripled, Yogi Bear's catchphrase
• "Hey there!"
• Furtive "Hey!"
• "Yo!"
• "Watch it!"
• "Over here," quietly
• "Hey, over here!"
• With 53-Across, a Beatles song