Negative cash flow was used in a loose sense.
My salary is about $160k. The rest of my comp is from my year end bonus. When I say I am negative cash flowing each month, it means that my monthly expenditures exceed the $13,333 I gross per month. I pay about $2900 a month in taxes. I pay $1800 a month into my 401(k). I pay about $600 a month in other payroll deductions (insurance, etc.).
That leaves about $8000/month. $6000 of that goes to my mortgage. If you ignore that part of that $6000 is discretionary, that leaves $2000/month for food, clothing, entertainement, travel, utilities, gas and car maintenance, auto insurance, pool service, landscaper, etc. For a family of 6. Those things exceed $2000/month. Thus I am negative cash flowing.
But to be clear, I am not building up credit card debt each month, but rather am pre-funding that negative cash flow with my prior year's bonus. That is, I build up $50-$60k in savings at the end of each year and then draw down on that over the course of the following year. The remainder of my bonus beyond the $50-$60k goes towards taxes ($35k), my employer match of my 401(k) since I am self employed ($10k-$12k), paying off any debt I accumulated from the prior year for unforeseen expenses (new AC unit, etc.).
That should clear up the misimpression I created with the term "negative cash flowing."