Definition & Meaning of "ding-head"in English

What is the origin of the term "ding-head" and how is it used?

"Ding-head" is an English slang term that emerged in the mid-20th century to describe a stupid or foolish person. The word comes from the metaphor of a "ding" as a small, hollow, or minor damage, suggesting someone whose head (and by extension mind) is slightly impaired or not functioning properly. It is mainly used in informal, humorous, or mildly critical contexts, often among friends or in light teasing. The term is derogatory but relatively gentle and rarely deeply offensive.