Related Clues:

• Stagecoach shout
• Attention-getting Mitchel Musso song?
• Attention getting e4xpletive
• Cousin of 'OMG!'
• Horse stopper
• Stagecoach driver's "Stop!"
• Command spoken while pulling the reins
• Laid-back greeting
• Distress, we hear, that may stop runner
• Shout of protest
• Alternative to 'Psst!'
• "Take it easy, horse!"
• 'That can't be right!'
• "Yo"
• Doctor with a word of caution