OP didn't really ask for your definition of the word. OP asked broadly and in quotes. And, yes with a large enough amount of mouths to feed and house, 300k could not be enough to support that and you could be poor. Granted, its unlikely.

All of that aside, I think you're just biased because you don't live in an area like SF. To you 200k seems like a lot of money, so you can't fathom being poor with that income. Poverty line in parts of the bay area is $150k.

What you don't seem to understand is the cost of housing. A 3 bedroom apartment or house (normal boring house) will cost between $5000-$20000/month. That is barely affordable on $200,000 after taxes.