More commonly a female, she is an entrepreneur of cock with a special burning desire to milk every man of his precious baby gravy, proudly displaying it upon her face, breasts or any other part of her body that has not been lathered in scrotum juice as if she was mounting a trophy above her fireplace.
A dipping sauce ordered with every meal by every fat girl ever. Breakfast, lunch or dinner, chicken strips, pizza, a side salad, or carrot sticks, it doesn't matter how healthy or unhealthy a dish is, a side of fat girl sauce is a great way to add a few more calories.
Fat girl: Can I have a side of ranch with that please?
Waiter: (Whispers to self) One side of fat girl sauce, got it.