pataquès

Etymology
From the erroneous example phrase je ne sais pas-t-à qu'est-ce "I don't know what is this".

Noun

 * 1) 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)
 * 2) malapropism
 * 3)  jumble, muddle