Rather than defining it per se, Deleuze and Guattari use scizoanalysis as a tool. Since necessity is the mother of invention, in other words, one may come to better understand schizoanalysis by specualting about the need which necessitated its formulation as a tool. The Oedipal myth, as it came to be employed by psychoanalysis, ossified. It became a rigid structure, a stratum , in which particle flows and vital energies are shut down, made to serve the myth and reproduce the myth. Not only is psychoanalysis advocating a model that fails to accurately describe the human psyche, but what's worse is that psychoanalysis becomes a tool of repression, a tool of the bourgeosie, capable of producing only consumers and lack.
Psychoanalysis does nothing to cure illnesses.
It creates them. Hence, instead of participating in an undertaking that will bring about genuine liberation, psychoanalysis is taking part in the work of bourgeois repression at its most far-reaching level. Like most theorists, Deleuze and Guattari propose the model of the schizophrenic because it serves their interests in this case, specifically because the schizo is un -theorizable. He doesn't like their resistance to being oedipalized, and tends to treat them more or less as animals. They mistake words for things, he says.