A female human being who, despite being overweight with a large, wide stomach, has inordinately small breasts and a flat buttocks, thus taking on the shape of a box.
1) Oh dear Jesus, I was talking to this chick I found on Myspace, but she sent me some nudes and she's a total box cow!
2) I'm telling you dude, this chick was such a box cow. She must weigh 200 pounds, but her chest and ass are flat. It's disgusting!