It's a semi-ironic derivative of trve cvlt black metal where the guitar tone is so insanely distorted and compressed that only the highly trained ear can pick up the single notes, so it sounds crusty.
Also, the vocals tend to be pretty fucked up, like, imagine a weird hybrid between hardcore punk shouting and black metal shrieking.

Oh, and it occasionally has some power metal thrown into the mix, but it's so fucked up--i.e. the vocalist won't hit a single note correctly, the composition sounds so completely flat, and the melodies sound like clown music--that it is generally considered funny.
Guy A: "man, Darkthrone 's new sound is shit. I mean, not as in "the shit", no, I mean it's, like, really bad, man"
Guy B: "Yeah, didn't you watch Anthony Fantano 's review of it yet? Apparently, they call it crustcore now. The whole genre is one big mistake."
by knight in filthy, filthy armor February 7, 2019
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