Go Time! is a phrase used to indicate that it is time to begin a task or activity. It is often used in sports, when the referee blows the whistle to start the game, or when a coach tells their team to get ready to start playing. Go Time! can also be used in other contexts, such as when a group of people are about to start a project or when someone is about to take an exam. The acronym ITS stands for 'It's Time to Start' and is another way of saying Go Time!