Rectum Scale Share definition Flag A system of measuring flatulance. Similiar to the Richter Scale but used to measure assquakes as opposed to earthquakes. Man... i dropped a bomb in class today that must have been at least a 7.5 on the rectum scale. Rectum Scale by jerk jiggler February 20, 2005 0 0 Get merch Get the Rectum Scale mug. Buy Now — $32.95 See more merch