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!
A small piece of information. Derived from the word ken, used often in the scottish language and is synonymous with knowledge.
Person 1: "Hey I don't get this shit. How do you solve this problem?"
Person 2: "I got that one. Give me some kenlets on this assignment and I'll help you w/ that one."