I think they're referring to people who set up camp at a table or two at these all you can eat buffets.
They typically sit at a larger area (normally next to the television), and are usually accompanied by children or infants.
They stay for hours on end and will occasionally get up to grab more food.
I don't see how anyone can do that to themselves. Imagine sitting at a restaurant all day watching daytime television and eating food, my ass is hurting just thinking about it.
I love a good buffet and can put one out of business with the amount I eat at one, but I can't see myself being at a table or in a booth for more than an hour.
Holy shit, this is what I've been needing for reddit since the API changes!
I can once again filter out whole subreddits, words, and emojis!