What do Americans mean when they say they live "paycheck to paycheck" ?

I'm from third world so I can't really grasp this when I look at the average consumption of Americans from charts and stuff, i like to browse Our World in Data and similar websites for fun.

I understand that cost of living is higher in US, which is why I'll try to focus on actual consumption of goods and services.

There's just so much food (and affordable!), absolutely huge houses and 65% ownership rate, you guys apparently eat out every week, almost everyone has AC, mind boggling level of electricity consumption, half of Americans and 85% teens have iphones (that's like my 3-4 month salary here and I'm well off relative to average person here), 75% have travelled abroad. and more guns than people; i suppose that's expensive too. even the life expectancy thing seems to be more about social problems of drugs, guns, accidents and obesity rather than healthcare, Financial Times did a post on this.

I know this sounds like a salty rant from third worlder (it kinda is) but I actually want to know what these charts and data are missing out on. Reading things is not a substitute for experiencing it.