Related Clues:

• Casual email opener
• Fellow Yankee’s call for attention
• 'Hands off, that's mine!'
• "Watch it, you!"
• "Watch it, I'm standing here!"
• Convo opener
• Upbeat greeting
• 'Sup!'
• Call to Jude?
• 'What's up'
• Song word sung twice before "goodbye"
• "Hi" relative
• “What’s the idea?!”
• "Watch it, buddy!"
• Informal "Hello"