Related Clues:

• Hissed nudge
• Furtive "Yo!"
• Give a heads-up
• ''Over here''
• Alternative to 'Yo!'
• Furtive ''Hey!''
• Soft attention getter
• Refer (back)
• Classroom attention getter
• Wordless summons
• 'Hey, you over there'
• Note-passer's utterance
• Hissed "Hey!"
• ''Hey, mister!''
• Hissed "Yo!"