Place it right after the confusing line in your edit, then follow it with the Awkward Moment sound for a second beat, or stack the Eh Eh Ehhhh sound before it to build a back-and-forth of failed answers.
À propos de ce son
This is a very short vocal clip, under a second long, made of fast rolled sounds like hrlrhrllrrlrlr with no clear words at all. It feels silly and bewildered, like someone trying to answer and producing pure nonsense instead, which makes the confusion instantly funny to hear.