Yes, true.

My question is how can "Anime girl diarrhea explosion" fail in funny and evil, yet still be an accurate description?

The contrast of the quotidian form with the abject content is what gives this work its frisson of uncanny jouissance.

for the frisson

I would argue that this is a textbook example of Lacan's theory of the mirror stage. The signified fails to connect to the signifier due to an execution that forecloses the possibility of recognition of self in the event depicted and thus cannot bind to our attention. Having thus failed, this work cannot enter into the Imaginary.

Also it's just kind of shit.

It also works pretty good as a "State of PoeTV" video