(n.) A debilitating sickness which can present a wide range if symptoms which include: Unsightly buboes, bloating, flatulence resulting from impaired operation of the gastro-intestinal tract, meningial swellings resulting in reduced cognitive performance and which may lead to mental retardation in later stages of the disease, discoloration of epithelial tissue, especially at the extremities.
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?"