In the US, it's code for "feeder fetish porn."  In Korea, it's non-fat people having a video conference with their subscribers while enjoying a large yet agreeable meal.  At least that's what I've seemed to notice.  I saw a Korean one once, and it was a live stream where the person eating was normal sized and was simply speaking with their subscribers while eating a large,yet healthy looking meal.  All of the ones I've seen in the US are deathfats recording themselves gorging on gargantuan amounts of junk food while moaning like $10 whores.