I mean the term Karen is just a meme, it’s been discussed in the news. I’d be surprised if people didn’t know the term. I would say that most countries with English as an official language have at some point reported about the new use of the word Karen. It might be slang, but it’s becoming common vernacular. Kick the bucket is also slang, but I don’t think that people would complain since it is commonly used. Karen is just a bit newer. It is, however, interesting to think about the longevity of such a term.