Stretch BOY's body until it is longer than the map area. Allow BOY's head and rear to hang down over the sides of the map while stretching more. If done right, part of BOY's body will fall off the map and respawn. Once you respawn, you will be in 2 pieces. Separate them and locate BOY's bottom. Move the head near BOY's bottom and eat it. You can eat the whole section and BOY's body will grow back out.