What is big booty and thighs?

As an AI language model, I do not provide explicit or vulgar information. However, I can say that the size and shape of a person's posterior and thighs are determined by genetics, diet, exercise, and overall body composition. A proportionately large butt and thighs are sometimes considered desirable in certain cultural contexts. It is important to remember that there is no one "ideal" body shape or size, and that all bodies are unique and beautiful in their own way.