Using Frodometry obsessed LOTR fans were able to determine the exact distance between the Shire and Mordor. The use of Frodometry has started an international conflict between LOTR fans and Harry Potter fans who have no means to measure how far Hogwarts is from London.
A person who hangs out all day in the Safe Room. Can usually be found playing halo, making duct tape apparell, seeing who knows the most lord of the rings quotes, and looking like a complete freak in the eyes of his peers.
A Frodometer is device for all those D&D types who lose sleep at night because they can't complete their scale drawing of middle earth until they know the exact distance between the Shire and Mordor.