grizzle plug
A turd/Blockage that is beyond the size and scope of comfortable passage through the anus. Usually passage is achieved through brute force and sheer determination. If "Grizzle Plug" is a regular occurrence consider water births or short shallow breaths. A possible change in diet may be required if "Grizzle Plug" persists.
"I had a gnarly "grizzle plug" blocking me up this morning but thankfully I had a bran muffin and cleared that plug for passage."