Defamation

The art of ruining someone's good name by spreading untruths.

Sometimes, the things Fangirls and Badficcers make Canon characters say and do are downright slanderous. This technically makes them libel, being as libel is the written version whereas slander is perpetrated by physically speaking the lies.

Slander and libel have friends - defamation, calumny and vilification. All of these are Bad things. It is not nice to do these.

Slander, libel, defamation, calumny and vilification are all Charges, and good, sonorous words to use in your Exorcism.