SMTH is a short-lived slang for "something" commonly used in texting, chatting, and random messages. This helps users shorten long words and write quickly. Instead of saying that "I need to tell you something," can I write "I need to tell you smth." It is recognized in informal digital communication, especially among young users. Despite its random nature, SMTH is usually understood by most people who are familiar with the internet hose or text shanties.