It is important to understand the term "what does kys mean" in different contexts. The KYS stands for "Kill yourself", which can be used seriously and jokingly. In severe cases, it can be harmful and aggressive, especially if used to offend someone. However, among close friends can be jokingly used, although it is still. The importance of kisses depends on the situation and who uses it. It is always best to avoid using this phrase, as it can be wrong.