Politically incorrect language means something that is not socially acceptable to say -- it often has to do with racist, sexist, or generally outdated or prejudicial language. Words change over time and become politically incorrect -- offensive to many people. For example, in the UK, it is politically incorrect to say "handicapped" or "retarded" to talk about a disabled person, and it is politically incorrect to say "coloured" for a black or Asian person. You can also have politically incorrect views, not just words, also usually to do with sensitive topics. People in the UK, especially right wingers, complain there are things they are not allowed to say because they are taken to be politically incorrect. 不好意思，中文的翻译我不知道！