The term 'Grimm Guy' refers to the character of Hansel from the Brothers Grimm fairy tales. Hansel is a young boy who, along with his sister Gretel, is the protagonist of the story 'Hansel and Gretel'. In the story, Hansel and Gretel are abandoned in the woods by their parents and must find their way back home. Along the way, they encounter a witch who tries to eat them, but they outsmart her and escape. Hansel is known for his cleverness and resourcefulness, which helps him and his sister survive their ordeal.