“Karen is a pejorative slang term that is used to typify a person perceived to be entitled or demanding beyond the scope of what is considered appropriate or necessary. One of the most common Karen stereotypes is that of a white middle-aged woman, typically American, who displays aggressive behavior when she is obstructed from getting her way; such women are often depicted as demanding to “speak to the manager” and having a variation of the bob cut.”
from wikipedia
It was started by someone on Reddit who would go on epic rants about his ex-wife Karen.
Thanx