Onomatopoeia for the sound created by slam metal vocalists. Presumably, the vocalist making the sound is enunciating lyrics, but they are almost never legible, even if you're reading official lyrics published by the band.

The sound is sometimes achieved through the use of pitch shifting technology.

A cultural and aesthetic mind-state that prioritizes making money, even as an “underground” or “radical” creator. The work isn’t made for money, but it’s the money that matters the most.