TMI slang is often used good-natured when someone shares a weird or embarrassing detail. For example, if a friend says, I just ate a whole pizza by myself and now I regret it, replying with TMI! in a joking way makes the conversation funny. People also use it sarcastically, like, Oh wow, TMI. but also, tell me more! This playful use of TMI meaning keeps chats entertaining and lighthearted. So it depends on users how they use words and in which context.
