A dirty Mathieu is when you sexually abuse your mom in the shower until your sister walks in, when your sister walks in you make them scissor while slapping there tits as hard as you can until you make them cream in each others mouths.
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."