Definition & Meaning of "jolterhead"in English

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

"jolterhead" is a slang insult that likely appeared in English in the 18th–19th century, formed from "jolt," meaning a sudden shock or movement, and "head," referring to the person. The metaphor suggests someone whose mind or behavior is erratic, clumsy, or unintelligent. It was used in informal speech and literature to mock foolishness, stupidity, or awkwardness. The term is clearly derogatory, aimed at ridiculing mental or physical clumsiness, and is never neutral; it has mostly fallen out of common use today.