Pickle-herring is an old-fashioned term for a person who talks too much or speaks nonsense. This pejorative term has synonymic alternatives that can also convey the same meaning. Some of these synonyms include blabbermouth, chatterbox, gabber, gasbag, prattler, and windbag. Other slang terms that can be used for a person who talks excessively but without making much sense are motormouth, yapper, and jabberer. Regardless of the term used, they all point to someone who talks too much, especially when they should be quiet. These synonyms can come in handy in various situations, including when describing a person who annoys others with their incessant talking.