Related Clues:

• Furtive ''Yo!''
• Note passer's signal
• Eat in the eve
• "What's happenin'?"
• Head-turning sound
• Clandestine call
• Near-silent 'Hey!'
• 'Hey … you!'
• 'Pssst!' kin
• Hey, the quiet way
• Attention-getting cry
• Slangy "How's things?"
• Start of a whispered comment
• "Hey!" in class
• Cry for attention?