Related Clues:

• Clandestine signal
• Surreptitious sound
• "Hey, Mac!"
• Secretive attention getter
• Fence’s utterance
• 'Hey, over here!'
• "Hey there!"
• Furtive "Hey!"
• "Yo!"
• "Over here," quietly
• "Hey, over here!"
• Way to get noticed
• "Heyyy, buddy"
• "You there!"
• 'You, there'