Related Clues:

• __ you!
• Attention getter?
• Beatles' word to Jude
• 'You, over there!'
• 'Greetings!'
• Word on a dog-owner's sign, perhaps
• Sign of danger
• 'Heads up!'
• 'Listen up!'
• 'Gabba Gabba ___'
• Word of caution
• Breezy greeting
• Jabberwock advice
• Start of a sign on a gate
• ''Yo!''