-being completely chill and not letting anything get to you. often a comment will simply be answered by saying "chezz".
-the fact that something is just so cool it can only be described by the word "chezz".
The people on the beach were worried about the sharks in the water, but not Kate, she was totally chezzed.
Rob - "Dude, some guy just sideswiped your car!!"
Shane - "Chezz..."