Short form of "worse than a lump of shit dangling from a hair on a rat's ass". In reference to those exceptional fucktards one is forced to interact with every day.
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."