So it is known that big boobs can get people some back problems.
Recently ive been gaining weight. Like 5kg a week because of the constant dead in the family and tooo many failed relationships. So my buttocks got really bigger and even though i tried all lying positions it still causes my back to ache, especially my lower back and hips. The only way to stop the pain is too put my knees up to make my back becomes a flatline. But how can I sleep like that? Like gravity is killing me with the weight of my ass And I'm not even bottom anymore so how do yall fatty american deal with this?

I'm sorry but I don't understand how you could unintentionally gain 5 kg (11 pounds) a week. That's the largest weight gain I've ever heard of. I know people who TRY to get fat and probably gain 7 lbs a week, or a pound a day max. It seems very difficult to gain that much weight. I really think you should be assessing that before any back problems from a big butt, imo.

I have a big ass (squats) and my lower back is still fine. The problem is all that weight putting stress on your backbone’s discs. You should change your diet and start exercising. It will only do good for you.

Learn some basic back exercises to strengthen the muscles around your vertebral column. If you're not comfortable doing some digging on Google to figure this out there's always the option to go see a chiropractor. It's my understanding that they're the very best when it comes to dealing w/ back pain.

5 kg a week? Slay a bit fatty

5kg a week?! God help your body. I'm sorry to hear about your problems though.