Definition & Meaning of "bean head"in English

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

"Bean head" is an English slang insult that likely appeared in the 19th–20th centuries, using "bean" as a metaphor for the brain to suggest smallness or emptiness, combined with "head" to describe someone as stupid or empty-headed. The term is used in informal speech, schoolyard teasing, and lighthearted mockery to point out a person's lack of intelligence or common sense. It is derogatory but mild, usually humorous or playful rather than deeply offensive.