KMS is an acronym that stands for "kill myself" in social media contexts. It is an expression used to convey extreme frustration, disappointment, or stress. Although KMS only has one meaning, it is used in teenage slang to cover a range of emotions. While this slang expression is frequently used in a joking manner as a response to a negative event, it can also be a cry for help from a teen who is genuinely contemplating suicide. KMS is one of the most frightening messages parents can see in their childs internet messages.