Smaller than the foreskin, but longer than a twoskin. What you call your foreskin after you put it in a meat grinder. It's usually associated with an onion odor.
A cannabis joint or spliff made from 3 standard-sized cigarette papers. Two papers are stuck end-to-end with an overlap and the gum strip on the same side, and the third is used to secure the non-gummed side of the first two papers. The purpose is to make a spliff or joint large enough to pass around.
Have you got a king size Rizla? No mate, I only have regular ones for my rolling tobacco, you'll have to make a threeskin.
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?"