Definition & Meaning of "loudmouth"in English

What is the origin of the term "loudmouth" and how is it used?

"Loudmouth" is an English slang term that appeared in the early 20th century, formed from "loud," referring to volume, and "mouth," symbolizing speech. It describes a person who is obnoxiously talkative, speaks loudly, and often does so without restraint, drawing attention in a disruptive or irritating way. The term is used in informal speech across English-speaking countries, often critically or humorously, and is mildly to moderately derogatory, targeting behavior rather than inherent character.