Related Clues:

• Tugboat's horn sound
• Audible alert
• Get-together with Penny's a hoot!
• Electronic sound in live record
• [The light turned green! Go!]
• Accent sound?
• [You cut me off!]
• Respond to a bumper sticker, maybe
• Aural-but-unspoken ''Hey!''
• Smoke alarm alert
• Voicemail prompt
• Excerpt of YouTube episode synonymous with The Road Runner
• Engineer's signal
• Friendly greeting on the highway
• Motorist's 'Move it!'