Emo-violence was a term made up by the band In/Humanity to half-jokingly characterize themselves as a band that related to both the emocore and powerviolence scenes back in 1995-96. Many powerviolence fans stood opposed to all brands of emo in the mid-90’s even before that word became tainted and co-opted by the mainstream media. So, as a band borne from the emocore scene and continuing from the traditions of Born Against and Heroin, In/Humanity played up the “violence” side and the association with Prank Records, H:G Fact, and Sound Pollution Records to align themselves with heavier, more metallic powerviolence bands. It worked, and the band was well-liked by emo kids and powerviolence dudes alike.
“Emo-violence” might have been used around the same time by record reviewers to describe the sounds of the Indianapolis band Ice Nine.
It never really caught on as a name for a subgenre of hardcore.