1. a person who talks rapidly and incessantly
Usage: informal

Examples

• My little brother is such a motormouth that he never stops talking during car rides.
• The radio host was known as a motormouth who could fill any dead air.
• She’s a real motormouth when she gets excited about her favorite topics.
• The teacher had to remind the motormouth student to let others speak.
• His reputation as a motormouth made him perfect for the auctioneer job.
• The motormouth comedian delivered jokes at lightning speed.