The phrase "motor mouth" refers to a person who talks incessantly or speaks quickly without pause. There are several synonyms for this term, such as "chatterbox," "blabbermouth," "gabber," "yakker," or "windbag." A chatterbox is someone who talks too much or too quickly, while a blabbermouth is a person who cannot keep a secret. Gabbers and yakkars speak a lot but often without making sense, while a windbag is someone who talks in a pompous or boastful manner. These terms are often used playfully or teasingly, but when someone's incessant talking becomes an issue, it can be disruptive to those around them.