The term 'Freudian' refers to the psychoanalytic theories of Austrian neurologist Sigmund Freud. The two crossword solutions for this term are NEO (3 letters) and SLIP (4 letters). NEO is an acronym for 'neo-Freudian, ' which is a term used to describe a group of psychoanalysts who developed theories based on Freud's work but disagreed with some of his ideas. SLIP stands for 'slips of the tongue, ' which is a Freudian concept that suggests that when someone makes a mistake while speaking, it is often due to unconscious desires or thoughts.