The "problem" is there is varying perspective on what having a "big butt" means. As far as I'm concerned, big butt does not mean the following:
1. Your butt is only "rotund" because you are obese.
2. Your butt is wide but flat. A wide ass is not automatically a phat ass.
I'm all for celebrating different body shapes and the beauty of the rotund rear. I just want women of the African diaspora around the world to remember that a healthy body image should not be confused with being unhealthy. I also want women of other races and ethnicities to stop jumping on the big butt bandwagon if your butt does not truly fit the criteria. This includes, but is not limited to, the white women singing the big butt song when instead they have a flat rear or a flabby rear. Needless to say, that doesn't pertain to all white women because there are white women with rotund bottoms just as there are women of the African diaspora with nonrotund bottoms.
The research in the OP is probably talking about any extra meat in the hips and rear end regardless of how it looks. However, most of the Black men in this thread probably have an image of what they consider "big butt".