A "New Karen" is a pejorative slang term for female under 25 who is an obnoxious, angry, entitled, and often , homophopic, racist white woman who uses her privilege to get her way or police other people's behaviours. Usually this type of person has a mother who is an "Old Karen".
New Karen was practicing complaining to management that they way she was served by the clearly gay customer service representative was inappropriate because he was impolite, even though he was not impolite, just happened to have a camp sounding voice that New Karen didn't like, so New Karen made up some bullshit to get him in trouble.
Typically and engine-nerd with a propensity to dissect and verbally admonish all your actions despite the fact that it has absolutely no effect on him. A strong exhale of disappointment is usually followed after you experience the strong wrath of disgust and disappointment in you while never uttering a word of profanity however you then walk away with the feeling of “what a dick!!!”
Defined as; Kyle is the new Karen, and hates guacamole but watched me cut the avocado horizontally then yelled and huffed that I was doing it wrong, chill dude, just leave it alone man your such a Kyle!