A literal reference to the protagonist from the classic American novel, Catcher in the Rye, by JD Salinger, it can be used at parties and social gatherings to inconspicuously ask if anyone has marijuana to sell or share.
Dude 1: "Hey man, did you invite Holden Caufield to the party?"
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.