Definition & Meaning of "shitneck"in English

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

"Shitneck" is a slang insult that appeared in English in the mid-20th century, primarily in the United States, as a crude way to express contempt or irritation toward someone. It combines "shit" (signifying disgust or worthlessness) with "neck," likely used to refer to a person's head or as a general derogatory suffix, creating a vivid term of disdain. It has been used in informal speech, military slang, and gritty fiction to target people considered foolish, obnoxious, or contemptible. The term is clearly derogatory, rarely humorous, and typically used in direct, hostile, or emphatic criticism.