Definition & Meaning of "fartface"in English

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

"Fartface" is a childish insult that developed in informal English in the 20th century, built from fart as a symbol of something crude, embarrassing, or contemptible. The humor comes from bodily-function imagery attached directly to a person's identity. It is commonly used by children or adults speaking jokingly to express annoyance or mild contempt. The term is derogatory but low-level, usually playful rather than aggressive, and rarely intended as a serious insult.