ITTM in slang usually stands for In This Together. It’s used to express support, solidarity, and encouragement, especially when someone is going through a difficult or stressful situation. The phrase reassures the other person that they’re not facing the problem alone. You might see it in text messages, online chats, or social media when friends are motivating each other. For example, if someone is nervous about exams or a challenge, a friend might reply, ITTM, to show unity and support.