A dernoid is generally someone who is completely beyond retarded. Someone so stupid that the only word you could possibly use is “dernoid” can also be shortened to “dern”
“Omg bruv you’re such a dernoid” or “Jesus Christ you’re such a dern” or “omg that dude he’s a dern”
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."