"Karen" is a slang term that has become popular in recent years, especially on the internet and social media. It is often used to describe a certain type of person, typically a middle-aged white woman who is perceived to be entitled, demanding, or exhibiting privileged behavior. This term is sometimes used to characterize individuals who are overly assertive about their perceived rights, often in a public setting, and who may exhibit a sense of superiority or make unreasonable demands, particularly towards people in service or customer service roles.

The use of "Karen" has been criticized by some as being a stereotype or a way to dismiss legitimate complaints, while others see it as a way to call out rude or entitled behavior.

https://en.wikipedia.org/wiki/Karen_(slang)