The phrase "bloody diarrhea" refers to a condition where there is blood present in the stool or feces. This can be caused by various factors such as inflammation of the bowel, infection, or injury to the rectum and anus. Bloody diarrhea can also indicate more serious conditions like colon cancer, ulcerative colitis, or Crohn's disease. It is essential for individuals experiencing bloody diarrhea to consult a healthcare professional for proper diagnosis and treatment.