SSoHPKC is an acronym standing for something that Seamus only knows. PKC has already been confirmed BY SEAMUS and it stands for; Psycho Kinetic Collaboration. Which is a reference to Earthbound or the Mother series. With that said, Seamus has stated that SSoH does not stand for his name. He also stated that the acronym was made when he was 15 years old, and has nothing to do with his "Sarcastic Sense of Humor" that he developed later in life, during the end of high school when he used sarcasm as a defense mechanism.
Questions, comments, concerns?
I want to stress this VERY MUCH. Please listen if you're confused about SSoH.
The acronym has NOT been confirmed by Seamus. The only letter he has confirmed is, in is opinion, the most imporant one. The O, which stands for 'of'. Seamus' 1,000,000 sub video explains his plans about revealing SSoH, at time 8:33.
EXTREMELY revised by: Digisable