It is the name of a humorous, "stinky" puzzle game available on Google Play and Steam where players must solve puzzles to reach a bathroom.
It is often the designated code for a hazardous material spill or gas leak. download-code-brown
Informally, medical staff use it to refer to a patient having an unintentional bowel movement , particularly while under anesthesia during surgery. It is the name of a humorous, "stinky"
In some regions, like Australia, it refers to a system-wide external emergency (e.g., a pandemic or mass casualty event) that puts extreme pressure on hospital resources. requiring immediate evacuation and thorough cleaning.
"Code Brown" is the industry term for when someone has defecated or vomited in the pool, requiring immediate evacuation and thorough cleaning.