Wish fulfilment was a term coined by Sigmund Freud (1856-1939) in his work The Interpreation of Dreams. It refers to the satisfaction of desires through unconscious processes, for example in dreams, or even in more intense manifestations such as hallucinations.
Such desires are consciously repressed and their satisfaction excluded from a person's behaviour, usually due to socially imposed taboos or beliefs that make that person feel guilty. Therefore these conflicts arise in the unconscious.