by HorrifyingIndividual on deviantArt
Viower Excretion is what happens when an individual reads My Immortal for the first time and realizes the full extent of its horror.
The phrase originates from the fanfiction itself, when Tara Gilesbie advises her readers to partake in Viower Excretion in preparation of the contents of Chapter 14.
In actuality, it's probably just a misspelling of the phrase "viewer discretion".