Related Clues:

• Sound that may turn heads
• Subtler alternative to ''Yo!''
• It may precede the sharing of a secret
• Subtle "Yo!"
• "Hey!"
• ''Hey, pal, over here!''
• Informal conversation starter
• "Ahem!"
• Furtive call
• "Over here!" noise
• 'Over here!' noise
• ''Hey, pal''
• "Ahem" cousin
• "Check it out!"
• Sort of summons