Carl Jung's female equivalent to Freud's Oedipus Complex; the theory that during the Freud's phallic stage of childhood development, girls develop a sexual attachment to their father (or father figure), leading them to want to kill mother and marry their father. The name derives from the Greek myth of Electra, who wanted to avenge her father's death by killing her mother, who was responsible for the murder.
Guy 1: Don't date girls with an Electra complex, mate.
Guy 2: Why not?
Guy 1: They think their father is God; you'll never measure up.