An absolute overload of TMI, also known as Too Much Information, sometimes coming from one person but usually from two or more. Generally what is known as ordinary TMI develops into a TMI Fest when the victim of Too Much Information is forced to be in close quarters or within earshot of those who are sharing things that, really, you could have lived without knowing about. An example of such a place would be a bus (or any form of public transportation), a lunch table, a noisy classroom, etc. There is no way to get away from the excessive amount of inappropriate and disturbing statements coming at them from all directions, and so they become bombarded with TMI as a result.
Person 1: I had the worst bus ride today... The girl behind me started talking to her friend about her horrendous PMS. Then the Stinky Scene kids sitting in the seats around me all started discussing drug use and their frequent made-up sexual encounters with one another.
Person 2: Ouch. Glad to see you pulled through that.
Person 1: I'm surprised I did. It was a regular TMI Fest.