What does "uberbond" mean?

I am reading the following article:

Nelson, T., Maxfield, S., & Kolb, D. (2009). Women entrepreneurs and venture capital: Managing the shadow negotiation. International Journal of Gender and Entrepreneurship, 1(1), 57–76. https://doi.org/10.1108/17566260910942345

One of the persons interviewed in the article said

For Jenny: (Among men with a certain, shared background), There is a certain uberbond.

What does "uberbond" mean? I searched on Oxford English Dictionary, Oxford Advanced Learners Dictionary, Merriam-Webster dictionary with no avail

Solution 1:

uberbond may not actually exist outside of Sci-Fi, but...

uber can be...

...used before nouns to mean "extreme" or "extremely good or successful":

-Cambridge

although it might be better hyphenated as uber-bond. It is a loanword from German, and first usage in English possibly dates back to ubermensch as described by Nietzche in Thus spake Zarusthra (1883).

In your case, I would interpret uberbond to be a kind of 'male bonding' situation, or a "us and them" mentality as seen in Boy Scouts, the military, fraternities, social lodges such as the Moose, or even the Masons.