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one who cannot poop in a toilet in a reasonable manner may be said to have a prehensile rectum. A prehensile appendage is one that is capable of grasping or conscious manipulation. One with a Prehensile rectum is purposefully able to miss a large target such as a toilet.

the term originates from a post by Billy Rubin on the StraightDope forums in 2001.
Look, F***wicket,I know you got your problems. Do you have a prehensile rectum that you can extend on a stalk like a snail's eye and aim? How in the name of all that is unholy do you get poop everywhere?
by jaybirdlaw April 03, 2016
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