Definition & Meaning of "fleabag"in English

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

"Fleabag" is an English slang term that appeared in the 18th–19th centuries, originally referring to an animal infested with fleas. By the 19th century, it began to be applied metaphorically to people, describing someone who is dirty, shabby, or of low social or moral worth. The word emphasizes filth, neglect, or pitiful condition and was commonly used in both everyday speech and literature. It is derogatory, often meant to insult or belittle, and can be applied humorously in informal contexts, though it remains offensive when used seriously.