poo worms worms made from poo. Origin of phrase related to the misconception that poo worms are found in oysters contaminated with PSP (Parasitic Shellfish Poisoning).
poo worms i.e. "You are a giant pooworm." i.e.- "Your face is a pooworm."
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.
FRIEND A: "Did you just take a stealthie of me?"
FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"