I remember something like that too, I think that was around 2016 iirc, not sure tho.
Actually I think it would fit a Linkin Park demo rather than a song originally performed or written by Xero. Chester's ATS demo he thought would end up as a DBS song was called "Fucking Awesome" and we have a demo out called "TooLeGit", which seemed unlikely as a LP title too. but on the other hand, how likely is it that a song from the Xero era is out there, of which the name is unheard of, now that we have the One Step Closer book. Deftest seems to have been a home demo by Mark and Mike, so anything with the other guys involved, we should know already.