The logical fallacy “tu quoque” is pronounced /ˈtuː ˈkwoʊkwiː/ (too-kwoh-kwee).
Other accepted pronunciations include the following:
/ˈtyuː ˈkwoʊkwiː/ (tyoo-kwoh-kwee)
/ˈtuː ˈkoʊkwiː/ (too-koh-kwee)