A Porchdick is a guy who sits on a porch and is a dick to everyone that walks by. They are usually old, drunk, high, etc. Also they prefer to remain on a rocking chair or other type of chair with a big glass of scotch instead of confronting people face to face.
"Hey dude, did you see that old guy on the porch back there?"
"Yeah man, that guy is a great example of a porchdick. He called some six year old a pussy ass bitch yesterday!"
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.