Definition & Meaning of "bubblehead"in English

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

Bubblehead is a slang term that appeared in mid-20th-century English to describe a person seen as stupid, empty-headed, or oblivious. The term combines "bubble," suggesting lightness, emptiness, or airiness, with "head," literally labeling someone's mind as lacking substance or sense. Historically, it was derogatory but mild, used to mock or tease someone for perceived thoughtlessness or ignorance. Today it remains informal and lightly insulting, often appearing in humorous or casual contexts rather than harsh or vulgar speech.