So, here we are: Waifus. I learned about them recently! They are the pillow wives of anime fans, from what I can gather. Go ahead and look it up, if you dare. There's whole sites, and words, and sadness. Look at these chaps, "coming out" with their waifus at school!
These people are "real", by the way, in that they feel - and express! - some sort of strange devotion to their pillow... girls. Wives. Whatever! At least the majority of these guys will not breed.