In texting, "dead" is a slang term that is used to convey a strong emotional reaction, typically in response to something funny, shocking, surprising, or absurd. When someone says "Im dead," they are not literally referring to their physical state but rather emphasizing their emotional response. It can be used to indicate that something was so funny or unexpected that it figuratively "killed" them with laughter or surprise. It is important to note that "dead" is not referring to someone who is not physically alive.