the next check to go do normal things.  

I think you could loosely apply this to more responsible situations where you are putting all your money into savings and investing and leaving yourself very little spend between checks.  But, nevertheless, if you are anxious for that next check to arrive so you can go buy groceries and gas, or whatever, then you are living paycheck to paycheck.

But most people I would guess don't fit into that boat.  Most people who you might casually define as fitting into that definition are doing little or no investment, whether in low interest savings, or even with a 401k, and are just spending everything they make until they get the next check, and have nothing substantial or in savings to show for it.  Just earn and burn.