To focus on the activity in front of you and avoid all distractions; to "lock in" and get your work done.
When Doc Miller's students started fooling around in class, she told them to "get frosty," so they would start paying attention and get their work done.
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."