Definition: The profane word you're referring to is '99 M570Logitech.conf,' which stands for "Nine Nine and Five Seven Hundred". This phrase is derived from the term "99% Complete" and is often used in jest as a dig at Logitech's software. A humorous example sentence using this slang might be:
"Hey, what do you think? Is 99 M570Logitech.conf even remotely good for your computer?"