a slip of the tongue, often called a Freudian slip

a slip of the tongue or some other bungle that, according to Freud, reveals an unconscious motivation

The technical term for a Freudian slip (a slip of the tongue or the pen). Freud took these slips to be significant, betraying powerful but unconscious motives.

a minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc.