One of the RegenCHOICE question fields
User's free text notes on why an answer is refused for this question (for QAccept = refused) or what it is that is confusing (for QAccept = confused)
“Fu” is deliberately tongue-in-cheek: the combination “fu” occurs in both words, “refused” and “confused”, and it has connotations of F U.
It is probably not shown to contacts (why should it be?), but rather to system administrators or collaborators.