"Shot mouth" is a slang term used to describe someone who talks too much, often without thinking. There are many synonyms for this term, including chatterbox, blabbermouth, gabber, motor mouth, and yapper. Each of these words describes a person who talks excessively, sometimes to the point of annoyance. Other synonyms for "shot mouth" include gossiper, loudmouth, and windbag. While these words can be used to describe someone who talks too much, it's important to remember that everyone has different communication styles, and what may be excessive to one person may be perfectly normal for another. It's always important to be respectful and considerate of others when communicating.