pushers, sliders, and runners

The amount of poop-related jokes on channel never fails to amaze me. This is either a comment on:

Anyways, these three terms are often used in conjunction with "nth degree" and describe progressively more effortless bowel movements, as follows:
  1. pushers escape the body only after an uncomfortable (often painful) amount of effort and strain;
  2. sliders leave the bowels with almost pleasurable ease and very little effort; and
  3. runners aptly describes both a thin liquid movement and the tendency to "run" for the toilet at its onset.