Hyper segmentation is a two step segmentation method.
In the first step, we may have 50-1000, any number of segments/groups that captures a wide variety of groups of consumers, called micro segments, the idea being to explain as much variation as possible.
In the second step, we bring together these large number of micro segments in to a manageable number of hyper segments, usually any number between 5 to 12.
The first level segments could be detailed list of micro segments that could run into 100s or even thousands.
There are standard statistical methods to do the hyper-segmentation; any clustering method can be applied to the microsegments to get to the hyper segmentation.