Definition & Meaning of "dittohead"in English

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

Dittohead is a slang term that appeared in late 20th-century English to describe a person who mindlessly agrees with someone else's opinions without independent thought. The term comes from the practice of writing "ditto" to repeat what was previously said, combined with "head" to label a person, literally meaning someone who just repeats others' views. Historically, it was derogatory, used to criticize blind followers or unthinking supporters, and today it remains informal and critical, mainly appearing in political or social commentary rather than polite conversation.