Related Clues:

• It may turn some heads
• Subtle attention getter
• "Hey, you!"
• Learn in passing
• Furtive whisper
• Find out
• [Look over here!]
• When doubled, a shout of approval
• Sotto voce call
• Subtler alternative to 'Yo!'
• 'Did you ___ that?'
• "Hey you!"
• 'Hey, buddy'
• Use one of the senses
• Conversation opener