not in Kansas anymore

"not in Kansas anymore" means no longer in quiet and comfortable surroundings. It is one of many casual words teens pick up from friends, social media, music or sport, and on its own it carries no particular warning. If you hear your teen use it, it is fair to ask what they mean by it in their friend group, since meanings drift quickly. Asking out of curiosity rather than alarm tends to keep the conversation open and useful.

"not in Kansas anymore" is informal English meaning no longer in quiet and comfortable surroundings. It is mainly used in North American English. A more formal or neutral equivalent would be something like "no longer in quiet and comfortable surroundings" expressed in standard vocabulary. A common mistake is to assume "not in Kansas anymore" can replace its standard equivalent in every register; keep it for spoken or casual situations and use the formal form in writing. If you are a B2 or C1 learner, it is useful to recognise this word when you hear or read it, but think carefully about whether the situation really calls for it before using it yourself.