A specific part of a psych ward in a hospital. It is filled with people who have overdosed on a psychedelic, or several psychedelics, particularly LSD, Ketamine, Mushrooms, or a combination of Diethylamides. It is also known as the part of the psych ward where there are people who have done so many psychedelics that their brains have developed permanent hallucinations, and so the people will often have a rest of a life where they are practically always on some sort of psychedelic or mixture of psychedelics.
"Evan went to the slater ward, because the night before he dropped acid
after he was already on ketamine."