An omni-shredder is a small handheld device that turns anything fed into it to mulch. They're used to protect confidentiality in the workplace. If you modify it to wear it on your face and look like a mouth, you have what vorephiles call a meatmask. It puree's meat and bone and shoots a messy meat smoothie down the throat tube of the wolf-wannabe. A meatmask is illegal, like you didn't know.
"I bought a second handbroken meatmask off ebay, it gets me hot, just thinking about how many people it gobbled up."
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.