Pullin an "emilio" means starting a chat with someone on an IM network such as on Facebook or Myspcae and in mid conversation you log off without notifying the other person involved in the conversation!
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.