The Whole Sort of General Mish Mash (WSOGMM) is the sum total of all the different ways that exists of looking at things, or more specifically, all the different probabilities that exist through which you could look at things.
The Whole Sort of General Mish Mash is a metaphor created to help people better understand a part of the complex concepts presented by the complicated web of probabilities and possibilities (parallel universes, one could say) presented by creation.
The Whole Sort of General Mish Mash, one could say, should be viewed as a plate of pie, or as a large tank of water. You could slice it and divide it up any way you'd like, and you'll almost always find a way of looking at things somewhere in probability (a parallel universe) that somebody will find familiar.
It should be noted that the idea of the Whole Sort of General Mish Mash supersedes the very idea of parallel universes, and that the term is used in the above article only because it provides a comfortable thing with which one can equate, and better understand, the WSOGMM.