"Big Balls" is an online nickname that Edward Coristine has used.
He is a technologist and a staffer of DOGE (Department of Government Efficiency). Several media outlets have raised questions about whether he could pass the background check for security clearances.
He owns an entity named "Tesla.sexy LLC" and worked at suspicious startups where hackers worked.
Elon could not have anticipated this situation with this staffer. In his private company, these sorts of past records may not be a serious matter or easy to be opened on public. And then if the staffer works well, everyone may be happy altogether.
But DOGE is a government department and taking an important role under the Trump administration.
This issue has already become a good target for attack by woman-friendly or libertarian advocates who oppose budget or cost cuts.