Related Clues:

• Attention-getting noise
• Listener's approval
• It's attention-getting
• It may precede "Over here!"
• Sound before "Yeah, you!"
• Whispered exclamation
• Companion of Winken and Blinken
• Betray inattention
• Mute assent
• Wordless "yes"
• Brief acknowledgment
• [Over here!]
• ("Hey you ...")
• 'Hey, over here!' hiss
• Low "Yo!"