What is Dern sure?

"Dern sure" is a word used by a crazy man the loves cats and says "what the brown","OH MY MEOW",or simply just "meow", "Dern sure" is used when you are very sure of something. this mans name is jordan others call him hordan but he is better know as Kootra. Kootra is a youtube video game commentator and leader if "The Creatures" he Dern sure is funny.