From Spanish (mostly used in Spain), a derogatory word for someone with down-syndrome (Mongolism); English equivalent of mongo. It also can be used for retard, dumbass, spasty, jerk, junkhead etc. Mostly describes a person with very low IQ and behaving stupidly all day.
Que te pasa? Eres mongolico? What's wrong with you? Are you a mongo (mongolico)?
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."