I wont pretend i have any idea what your all talking about, because im clueless, but it dont sound good.
In very simple terms it's like pass the parcel and works like this:
1. Your local bank gives you a mortgage to buy a house.
2. Your local bank gives lots of other people mortgages to buy houses.
3. Your local bank packages these mortgages up and sells the debt onto other organisations. Other banks, pension funds, hedge funds etc.
4. These debt packages get broken up, rebundled and flogged onto other organisations numerous times as part of the billions of dollars worth of debts that fly round the global banking systems everyday.
5. Your local bank realises that they can give a mortgage to any jobless schmuck with a pulse and simply flogg the debt (known as toxic debt) onto someone else, so they do this and get away with it for a few years.
6. Then one day, a few of the big players get suspicious of the debt that they have and start frantically re-evaluating the quality of the debts they own.
7. Everyone follows suit, the debt markets seize up and the ones holding all the toxic stuff find themselves up shit creek.