I'm looking for the best way i can loose a very large chuck of my body fat on my back. Any sugestions?

You cannot choose where the fat is going to be burned, "spot reduction" doesn't exist, the body burns fat gradually from all over your body.
The only way would be lipo, but unless the problem is really bad (stetically) it is better to eliminate the fat naturally. Sooner or later the fat on your back will be burned.

Peter's right. You gotta do aerobics to burn the fat off all over. That means the boobies will shrink too.