This paper introduces and develops the concept of Psycho-Cosmocide: the total colonisation of human consciousness through systems of meaning rather than systems of force. Drawing on analogies from parasitology and ecology, the argument traces a developmental spectrum from integrated pre-civilisational existence through progressive stages of structural distortion—designated here as Civi-lie-sation and Evi-lie-zation—toward the complete occupation of perception, identity, and reality-making capacity. The paper further proposes Wonesis as the term for the counter-movement: a conscious reawakening and existential reconstruction of self, grounded not in nostalgia but in the deliberate recovery of original language, memory, and meaning. The analysis operates at the intersection of philosophy of mind, decolonial theory, and critical civilisational studies.