The Freudian slip, also known as parapraxis, is a concept that is a part of classical psychoanalysis and is named after Anna Freudwho referred to these as Fehlleistungen (faulty functions).
The Freudian slip is named after Sigmund Freud, who, in his 1901 book The Psychopathology of Everyday Life, described and analyzed a large number of seemingly trivial, even bizarre, or nonsensical errors and slips, most notably the Signorelli parapraxis. 
