An expression used to describe anything that is very, very slow. (since a line of people waiting to get out of Hell would logically not move at all!)
Cell phone call:
Guy: Hi, I'm going to be a bit late.
Girl: Why?
Guy: I'm at the grocery store and this line is slower than the line out of hell!
Girl: Well, get here when you can!
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.