Il a fait un pataquès de son discours - His speech was an incoherent jumble.
faire un pataquès - to make an incorrect elision/liaison
Example: "Tu es allé" should be pronounced [tu ay a lay], but many French learners (including myself) unconsciously add a T (es => est) and say [tu ay ta lay]. This is known as a pataquès - mispronouncing a French phrase by adding or changing a liaison.
More: French pronunciation
(click the little graphic below to hear the Mot du jour pronounced)