It means disgusted, angry, angry, brave. It is a inflection of grimar, which means to anger, to upset, to infuriate, to embravecer. It also means that you have your teeth untempted by the action of something very cold and very acidic.
GRIMADO 1 . Word part of the glyph of chapter 68 of Rayuela, by Julio Cortázar (see incopelusas). It could be translated by squealing, whispering or lamenting. 2 . Grima from the Grimmis Germanic, horrible. Very unpleasant physical sensation that is experienced when listening to a sound, such as that of chalk when fried against the black board.