Grim is a state of being. To be grim is to be like the frozen wilderness of Finland or the black tar pits of Goblod' Bul. It defines the meaning of full-life consequences and the permanence of death. It is severe and cruel, and mirthless in its over-the-top reveling of itself. To be grim you must indulge yourself in The Lord of the Rings and memorize Sindarin, listen to Immortal for every second of your life, and eat raw eggs and rich fibers for breakfast (constipation is very important for grimality).