Poo Magic

The bizarre actions of a crazed/mentally ill individual or individuals, which seem to make complete sense to them for an esoteric reason ie: vabbing, self-harm, wierd tweaker gesticulation or fecal graffiti.
Poo Magician/Poo Witch/Poo Wizard

Oh no, a poo magic practitioner.
It's poo magic, just get some help!
Ah, the local poo magician/witch/wizard.