The term 'Grim Grimm Guys' refers to a group of OGRES, which are mythical creatures typically depicted as large, hideous, and monstrous humanoids. They are often featured in folklore and fairy tales, and are known for their strength and ferocity. The term 'Grim Grimm Guys' is a play on the Brothers Grimm, who were famous German authors who collected and published folk tales and fairy tales during the 19th century.