Robo-signing is when a bank uses employees to sign court documents.
The problem is that these employees just skim over the paperwork and don' t actually know whether or not the person is truly at the proper point to default....which makes it illegal.
A bank is not suppose to foreclose without an employees personally knowing all of the details.
This is why many banks suspended foreclosures at some point.
"Robo-signing", where people are signing documents like robots. The term became popular in the mortgage foreclosure crisis and often referred to circumstances where employees were signing another person's name and that's where it became fraudulent.