this refers to a
business that gives it's employees low salaries and no pay for overtime while requiring long working hours and with little to no days offs. these companies are also known for allowing several kinds of
harassment of employees while working there.
the term originated from japan and gained traction
outside of it with the rise of the net.
"I don't think you should
work there as I heard 'fake company name' is a
black company. you should
work at 'super fake company' instead"