Hi Patricia,
Having checked with the team and with some people in France, it appears that no one has heard of the word 'Chafouiller'.
From the context, it would be the equivalent of 'déranger/ ennuyer/ embêter ( what bugs someone).
We suspect that the 'locuteur' probably mixed up a couple of similar verbs - which can happen to anyone on the spot.
As it is a third-party resource ( for which we did the transcript ) we can't say any more than this but are prepared to be enlightened if the word actually exists as language is always evolving.
Good conversation!