Sickballs is another form of saying 'awesome' or 'great' most commonly used in slang conversations. It's main use is to signify approval or to show appeal about the subject of the conversation.
Person1: "Hey man you've just been selected to get kidnapped this year!"
Person2: "That's sickballs!"
Person1: "Yeah that's sickballs fr fr."
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."