A method used to measure a
person's penis size. It is measured by where the skitmark is left on the toilet
bowl.
In the front indicates a small penis size, in the middle indicates a medium penis size or good sanitation after using the toilet, and on the back indicates a big penis size.
This method works for mosts toilets, and is considered
solid proof.
Jon: "Hey!
Bob just got finished taking a shit! He always brags about his big cock, let's check it out once and for all by using the toilet ruler"
Kyle: "MAN!
Bob really does have a huge dick! The skitmark is at the very back of the toilet bowl!"