So someone told me you can spread butt up 9 inches, so can you fit a watermelon in your butt?

With enough streching and practice, there are some impressing stuff that can fit a butt. Same for vaginas. Human flesh and muscles can be worked on to the extend of the bone structure. If you are that curious, just go on your friend Pronhub! There are literally Channels dedicated for this ;)   reply

Just try it if you're that curious no one is stopping you(๑•̀ㅂ•́)و✧ u can do it   reply

Unfortunately not, according to google, your average watermelon is about 10-12in wide :0   reply