A poop log so long and sturdy that the tip pushes against the bottom of the toilet bowl while the upper end is still inside you. Depending on how much poop you still need to unload while dealing with a pillar, it can be problematic and even painful.
I prefer toilets with deeper bowls to accommodate my log. That way the tip won't reach the bottom and risk causing a poop pillar.
by Rabbi Jimbob August 9, 2015