A knife stored near the toilet to chop giant concrete turds that would otherwise clog the toilet. Poop knives should be dull (since an accidental skin laceration would result in infection) and long-handled. Poop knives should never be used during the bowel movement.
by Sheridan Bucket June 28, 2008
a knife that is usually used for cutting up big fat turds stuck in the toliet after someone has been constipated for a long period of time.
by olaf the pimp December 10, 2006