Way Way Too Much Information. Intensified form of your relatively innocuous garden-variety TMI.
TMI: "Man, I have wicked gas today."
WWTMI: "Man, those pickled-habanero burritos I had for breakfast gave me really vile gas all day. Every time I rip one it feels like dynamite going off in my colon. Come laundry day the skid marks are going to be a motherfucker, let me tell you!"