The attempt to kill herpes after you have kissed someone that you know or suspect to have oral herpes. Usually by pouring mouthwash, rubbing alcohol, or some kind of alcholic beverage on, in, and around your mouth. None of these methods are proven to work, but in your panic you try anything.
Bob: Why are you pouring Jack Daniels all over your face?
Bill: I'm herpaciding, I just kissed that hot chick and I think she has the herpes.
Bob: HaHa Bill has herpes.