it's all code words, this is not as conspirational as imagined by non-language speakers. A great deal of normal conversation / interaction is idiomatic given that it is difficult to create new words in logographic languages. Your point is valid though - how does AI learn this? I don't think it can easily, it is akin for an AI to keep up with street slang, it couldn't guess it an advance it would have to be trained in it, which seems it will need greater human attendance than alphabetical languages!