Something that demonstrates a distinctive retardedness surrounding it.... more of an air than anything else, a sort of "je ne sais quois" that tells you, inherently, that this person/place/thing is truly and utterly retarded.
My buddy dave, though suave in his leather jacket and sneakers, would be flush with retardicity any time he opened his mouth.
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.