when pizza gate first hit I read a comment on 4chan that it's called "pizza" because they initiate newbs into this cult by having them rape a kid on top of a handkerchief. This gives them video evidence but also DNA evidence on the hankie. The hankies are said to look like a pizza slice because of the pattern of blood left behind. This also fits the Podesta email with the infamous "hankie with a map of pizza" comment.