Definition & Meaning of "brickhead"in English

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

"Brickhead" is an English slang term that appeared in the mid-20th century to describe a stupid, thick-headed, or stubborn person. It uses the metaphor of a "brick" to suggest hardness, heaviness, and resistance to thought or reasoning. The term is mainly used in informal speech, teasing, or light criticism, often in schoolyards, workplaces, or casual conversation. It is mildly derogatory, aiming to mock someone's mental slowness rather than deeply insult their character.