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.
by Bionic Botanist December 03, 2009
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.
by Ryry February 08, 2012

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