Definition & Meaning of "rug-eater"in English

What is the origin of the term "rug-eater" and how is it used?

Rug-eater is a slang term that appeared in mid-20th-century English as a vulgar label for a lesbian woman. The term comes from the crude metaphor of "eating the rug," referring to performing oral sex on a woman. Historically, it was derogatory and insulting, used to mock or demean women for their sexuality. Today it remains extremely offensive, and its use is generally limited to crude humor, sexualized contexts, or discussions of historical slang; it is not appropriate in polite or neutral conversation.