A system of mathmatical equations for finding the actual size (not just the length) of a man's penis, as refered to on South Park.
Guy 1: Bro, i measured my dick and its an 8.3 on the T.M.I. Scale!
Guy 2: Nice dude.
A scale from 1 to 10 that rates the level of personal information you should give to a person.
Strangers are a 1 on the T.M.I. scale and a Significant Other would rate as a 9 or 10.
The longer you know a person the higher they rate on the T.M.I. scale.
Dude, you're only a 4 on the T.M.I. scale, you should not be telling me this. That is way too much information.