The wonderful thing that they call the emokerchief is a square bit of material that is folded up into triangles and tied around the neck. It is practically a neckerchief of the emo variety. If someone is found wearing one, they are most likely emo or wanabee scene kids with no lives or future ahead of them so put them out of their misery now and shoot or stab them up with your big gangsta knives as this is, of course, "Da Urban Dictionary Innit."
"Look at that emokerchief... Let's stab 'em up yo!"
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.