Definition & Meaning of "shithead"in English

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

"Shithead" is an English slang insult that appeared in the mid–20th century, combining "shit" with "head" to create a vivid metaphor for someone unpleasant, stupid, or irritating. The imagery implies that the person's mind or character is worthless or offensive. It is widely used in informal speech, military slang, comedy, and online interactions to express contempt or mockery. The term is clearly derogatory and vulgar, context-dependent, and almost always intended as an insult rather than neutral commentary.