T.M.I. Scale Share definition Flag 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. T.M.I. Scale by Ryry March 17, 2012 0 0 Get merch Get the T.M.I. Scale mug. Buy Now — $32.95 See more merch