it's literally what it means. this word is usually used to keep others from giving opinions / stop them from yapping.
such examples are:
consuming burgers daily keeping you big as hell
sex without condoms are keeping you big as hell dude
Initially popularized by YouTuber Cory Armstrong Fitness, the phrase refers to something, most commonly a food or activity, that causes weight gain or the inability to lose weight.
Mark: Why can't I lose weight?
Jimmy: 'Cause Fortnite is keeping you big as hell.
You looked this up because of all those spam comments under Santa Cruz medicinals videos didn’t you? It’s from the YouTube Channel “Cory Armstrong Fitness”. Not knowing the meaning keeping you big as hell ngl
Young men keeping you big as hell