Definition & Meaning of "clart"in English

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

"Clart" is a slang term from northern English and Scottish dialects, dating back to at least the 18th century, used to describe a dirty, messy, or contemptible person. The word originally referred to mud, dirt, or filth, creating a metaphor for someone perceived as unclean or socially objectionable. It appears in informal speech, regional literature, and everyday insults, often with a humorous or mildly scolding tone. The term is derogatory but relatively mild, more playful or teasing than deeply offensive.