A popular phrase amongst chavs and their ilk. A less formal way of saying "good sir, I believe you have wronged me, and I hereby challenge you to a match of strength to determine which one of us is the superior fighter."
Chav 1: *Walks into Chav 2*
Chav 2: What the fuck you doin', blad! You fuckin' startin', like?!
Chav 1: C'mon then bruv, I'll shank you 'ardcore like!
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."