I have hanging fat on the bottom of my stomach, if I get a BBL what will happen to my stomach?

Concerns about the appearance of the abdomen are very common among patients consulting with a plastic surgeon. Just like every patient is different…so too is every abdomen. Different problems require different solutions. Your board certified plastic surgeon is uniquely trained to identify the problems as well as the appropriate solution.
The abdomen is commonly addressed via liposuction or abdominoplasty (“tummy – tuck”). Which procedure is best is dependent upon the source of the problem. 
Excess fat deposits underneath the skin can be addressed via liposuction. Liposuction will not address any other issues and may worsen the situation if there are other factors at play (such as skin excess (the hallmark of which is stretch marks) and muscle laxity, see below)
Commonly patients concerns are centered around issues of excess skin as well as fat. A third factor, which is often overlooked by most patients is abdominal wall muscle laxity (typically seen in post partum mommies).  
The tummy tuck, also known as abdominoplasty is a surgical procedure designed to eliminate excess skin and fat and tighten the muscles in the abdominal wall to create a smoother and slimmer contour. The tummy tuck is designed to target areas of the abdomen that have not responded to diet and exercise, making it particularly popular among people that have a lot of loose or sagging skin around the abdominal area due to significant weight loss, as well as women with excess skin and stretched abdominal muscles following pregnancy and childbirth. 
You would do best with an abdominoplasty. Liposuction alone, while an option, would not address all of the issues common in a "mommy tummy" i.e. skin excess. There are alternatives including lipo with BodyTite which uses RF heating to address skin laxity as well as subcutaneous fat excess. These are all options, however, the abdominoplasty is the gold standard in your particular case for rehabilitation of the abdominal area.
Ultimately, your decision will hinge on your expectations. A BBL will offer gluteal volume and generalized trunk contouring at the cost of worsening skin laxity (as noted by the presence of stretch marks pre-op).
My recommendation would be for abdominoplasty and waistline contouring liposuction. Narrowing the waistline will serve the dual role of cinching the midline and accentuating the gluteal curvature.
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Thank you for your questions. Without some pictures or an exam, it is impossible to answer your questions. That being said, it sounds as though you are not an ideal candidate for a liposuction procedure. Liposuction removes fat tissue but does not treat excess skin. A BBL procedure would likely result in a poor outcome if the excess skin is not addressed. Make sure you are seeing a plastic surgeon who is board certified by the American Board of Plastic Surgery for your consultation. Best of luck!Dallas R. Buchanan, MD, FACSOwner & Board-Certified Plastic SurgeonVIVIFY plastic surgery

It looks that you have both adherence of "C" sections scar and fat accumulation in lower abdomen. It is impossible to say whether liposuction alone or combination of TT and liposuction is needed to improve it. In person evaluation is recommended.Good luck.