Definition & Meaning of "airhead"in English

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

"Airhead" is an English slang term that appeared in the mid-20th century, likely in the 1960s–1970s. It combines "air," suggesting emptiness, with "head" to metaphorically describe someone whose mind seems vacant or lacking substance. The term is used to describe a person who is forgetful, absent-minded, or not very intelligent, often in informal, teasing, or lightly critical contexts. It is mildly derogatory but not vulgar, typically intended as a humorous or casual insult rather than a severe attack.