It's the blue blotch near the center of this map of the CMB made using the Planck satellite. It represents microwaves, (light), that is of longer wavelenght than that of the warmer colors on the map. It is relatively cold radiation.
The popular theory, never actually proven I believe, is that there is no origin point for the Big Bang -- the universe simply expands out in the same way from every point. That could be wrong. I think the cold spot may be the an empty bubble formed around the origin point of the Big Bang as matter expanded away from it in a shell. Light crossing from the far side of this gap will have been traveling longer than other parts of the CMB which would make it more stretched out and colder than the rest, hence the cold spot.
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