The Mexican version of the well known wrestler Juan Cena. A Juan Cena may be someone that tells many Mexican jokes, or one related to Donald Trump. Not to be confused with Quan Cena, someone who
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.