Definition & Meaning of "barking head"in English

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

Barking head is a slang term that appeared in late 20th–early 21st-century English to describe a pundit or commentator known for loud, abrasive, aggressive, and openly biased opinions. The term combines "barking," evoking the noisy, forceful sound of a dog, with "head," referring to the person, to literally portray someone who talks aggressively or insistently. Historically, it was derogatory, used to mock or criticize overly vocal or opinionated individuals, and today it remains informal and insulting, typically used in commentary, media critique, or casual conversation rather than polite or formal discourse.