Also rip-down. Noun. An act of proactively and publicly besmirching or otherwise ruining another's reputation, except that a ripdown also involves some illegal sabotage (i.e., hacking and falsifying information) to make it effective. In the most extreme cases, the perpetrator seeks employment for an actual job in which they will be in a position of authority over their target's reputation. It has nothing to do with a ripoff, although it is possible to rip someone off and then rip them down.
He tried to do a ripdown on the author because he didn't like her book.