A BDSM practice involving the injecting of small amounts of other people's faeces under the skin. These then blister.

You inject your lover's feces under your skin and wait untill it festers and blisters; Then you rip the blisters open with your teeth, and lick up the festering shit.

A short-lived 80s body modification trend whereby fecal material was injected under the skin to raise (depending on your POV) either hideous pustules or aesthetically pleasing blebs.

an extreme form of masochistic behaviour, in which the slave is coated with fecal material until blisters are raised on the skin. Not for the faint-of-heart, or the sane.