A dirty Tegan is where every orifice in the body is stuffed with cream cheese, then at 11:29 pm yelling “all hail the cream cheese queen” and squeezing as much of the cream cheese out.
“Hey what did you get up to last”
“Not much just did a dirty Tegan”
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?"