noun, masculine/pa.ta.kɛs/
intrusive s, intrusive t (a type of speech error whereby a word-final /t/ or /s/ is pronounced for euphony, though it is not part of the word's spelling); malapropism; jumble, muddle
From the example phrase je ne sais pas-t-à qu'est-ce, or originally je ne sais pas-t-à qui est-ce "I don't know whose it is", a mispronunciation in which a "t" sound is inserted as an incorrect liason.