A mental health condition formerly known as multiple personality disorder, discussed in the context of a therapist allegedly validating harmful behaviors by diagnosing it in a patient.
"My friend started going to a therapist who told her at 28 fucking years old that she has DID (basically what used to be called multiple personality disorder) and slowly she started naming all of her "multiples" really stupid shit (like Zero and Mamie) and now the therapist is telling her she needs t"