This article is about the logical fallacy. For the historical quotation "Tu quoque, Brute, fili mi", see Et tu, Brute? For the play by John Cooke, see Greene's Tu Quoque. For legal defense, see tu quoque defense. Tu quoque (/tjuːˈkwoʊkwiː/;[1] Latin for 'you also') is a discussion technique that intends to discredit the opponent's argument by attacking the opponent's own personal behavior and acti