h2g2 The Hitchhiker's Guide to the Galaxy: Earth Edition

That's a tricky one. If it was easy, everyone would be doing it. It depends to some extent on what your timescale is for "fast" and what level of risk you are willing to accept. For example, gambling is one of the few fairly instant ways of making money - except that you need some to start with and are more likely to lose it. In the slightly longer term, signing up with a local job agency and taking anything which came along, from cleaning to nude modelling, is a possibility.

male model?,yes

Well, if that's something you would be willing to try, you should check whether you have a local art college and ask there. Apparently there is always a shortage of people, they don't care what you look like at all and the Job Centres won't let them advertise on the boards there for fear of offending other job-seekers. Illogical.

Sell everything you own! Although I appreciate this probably doesnt help.
Teacake

Well, depending upon your age, sex and nation of residence a possible job in the sex industry will earn you muchos dollas but could leave you with something much nastier. The alternative to getting butt naked for a bunch of horny hungover teenagers is to get butt naked for medical students whose departments are always looking for live models for demonstrations. Or any decent uni should have a psychology research dept looking for people willing to be paid to sit and watch tv and eat chocolate whilst their heartbeat is monitored, or some other such experiment.

Either way - good luck - If you get desperate, the black market for human organs has contacts everywhere!!!!