The Toilet Ruler 

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!"

The Toilet Ruler by chillsaster November 21, 2010

five seconds rule of the public toilet 

A rule apply for taking a shat in public toilet, stating that after you saw someone exited a public toilet, you can't enter and seat within 5 seconds, otherwise you will still feel the creepy warmth as if you are placing your ass upon another unidentified, disgusting ass that just pooped

Pete: Oh man I was about to shit my pants so I ignored the five seconds rule of the public toilet
Pete's boyfriend: We are not going to do anal for 5 months because of that

five seconds rule of the public toilet by cinamon_muff August 12, 2016