The FS is a widely used abbreviation on text messages, social media networks or apps such as Tik Tok, Instagram or Snapchat, and chats in online games. It is an informal, quick, and less formal way of showing agreement or confidence without typing in the entire statement: For Sure. You could find it in posts or replies captions, memes, or posts. For ex - you are coming tonight?-FS! Young adults and teens love using it due to its simplicity and versatility in fast and easy communication with friends. Know more about What Does Fs Mean