What is meant by the Oedipus Complex in Hamlet?

The Oedipus Complex is a Freudian idea (which comes from the psychologist Sigmund Freud). It poses that a young boy holds an unconscious sexual desire towards his mother, and this comes to manifest in different ways. One of these is Hamlet's utter disgust and condemnation of Gertrude's sex life. We feel he is in an awkward position to be speaking of this, and that he shouldn't be involved in at all. It's uncomfortable for him to be speaking so openly and freely of such a private, taboo subject. This attention towards his obsession is explored too in his language. He argues Gertrude's 'heyday in the blood is tame', or at least that it should be. His argument is one that follows the notion his mother is essentially too old to be having sex. Freud would see this as a sexual sort of envy due to Hamlet's Oedipus Complex, and the way this envy is manifested is through anger, jealously and obsession. This is manifested most clearly in the Lawrence Olivier production of Hamlet, where the protagonist throws his mother on the bed violently and the air is thick with sexual tension. It is important to note that this idea is just a theory from Freud, and instead of it being treated as gospel, should be seen as a lens in which Hamlet can be understood and viewed. This is a tool to further understanding, and can be implemented to see a more abstract but nevertheless informative perspective.