look up any word, like fleek:
The act of quick, aggressive sexual relations with an overweight partner. The decision to jellomash is most often made under the heavy influence of of achohol
Person 1: "Dang he just drank a fifth for his birfday and that fat chick eyein him."

Person 2: "He be jellomashin' fo sho tonight!"
by dawgs25 March 30, 2010