Related Clues:

• Obama nana
• Blast on a horn
• "Out of my way!" indicator
• Harbor sound
• Horn beep
• Trolley warning
• Blow your horn
• Whistle blast
• Driver's nonverbal 'hello'
• Tugboat noise
• Short blast of a whistle
• Train-whistle sound
• Whistle-blower's sound
• Tugboat's call
• Warning from a driver