The Terminology Fears Fire

There is a BFF done for today, but I want to wait to make sure that the word I came up with for shadow spirits is neither slang for a sex act, nor some arcane racial slur. I don't think it is either, but it's a word that sounds so deliciously unpleasant on the tongue that it feels like it must be something you wouldn't want to speak aloud...

Since I am at work and in the office, I am not looking it up until I get home.