my cat has big balls across her tummy but she doesnt go out.

 
My cat has big balls across her tummy but she doesnt go out.?
Balls of what exactly? If they're matted fur then groom her with a brush.Most bizarre question I've ever seen on here.
These big balls on your cat are known as cyst. And if your cat will not go out if it usually does so this is a symptom that the cyst are CANCER. You need to get it to a vet ASAP!
Big balls of what ? If it is big hairballs just grab sizers and cut them out ! But if it's not Hairballs IDK what to tell u. And I know i spelled sizers wrong.
Balls of fur? Take her to a groomer. Do NOT attempt to cut them out yourself. Cats have fragile skin and it sometimes gets pulled up into the mats. You could slice your cat open.