The meaning of this word comes from the original word of Shot which means to be burnt out or just do and act like an ass from doing drugs or anything along those lines. Shot load means that you are a load of shotness meaning that you basically suck at life and shuld just shut your mouth right at that moment someone calls you a shot load.
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.