Ashy Knees disease is a "disease" that make your knees look very ashy, usually because they have no moisture such as lotion. Ashy Knees disease can spread everywhere, such as your elbows, ankles, cheeks and nose. Make sure to lotion up before leaving the house, especially during the winter as during that season ashy knees disease is very, very visible.
Friend: "Omg have you heard that Miles has ashy knees disease?"
Me: "I told his dumb self to use lotion everyday! If he listened to me, his knees wouldn't be so ashy!"
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.