Where did the matter come from that resulted from the "Big Bang Therom?" What put it there and how did it get there? What was there before the so-called "Explosion that started the Universe?" How do we know that there are not other dimentions?
You almost inadvertently answered your own question there. Some current theories/speculation about the ultimate origin of the universe (i.e. the origins of everything that formed the matter and energy unleashed in the Big Bang) involve other dimensions.
:Edit:
And on a more relevant note...
An oxymoron is an oxymoron, a concept with a defined and limited meaning. A human construct. Not something that can be redefined at whim. Deciding that you want to give the word a wider meaning is one thing, but that does not actually make it so. For example, I can't declare myself a gibbon and expect others to accept my redefinition of 'gibbon', regardless of any real or perceived similarities I might, or might not, have to said primate.