What is when does it say your typing on snapchat?

When you are using Snapchat's typing feature, it will show "Typing..." to the recipient when you are actively typing a message in the chat. This is indicated by three dots that appear next to the recipient's name to indicate that you are in the process of composing a message. Once you stop typing, the "Typing..." message will disappear from the chat. Please note that this feature only appears in private chats and not in group chats.