Update it
Shaking your butt doesn't make it fatter, in fact it's mild exercise. What shaking your butt does do though, is wobble the fat on your butt. Because I have quite a lot of fat on my buttocks, my butt will wobble a lot more when I shake it than someone with less butt fat.
squats and lunges
Injections, aging, or becoming fat.
Oh that's easy!You make a sim and choose the body of a very fat man! NO, ok you hire a butler using the phone. then eat all the time without exersising then the persons fat
The stupid game doesn't let you. Try to have a baby.
Fat transfer or Brazilian butt lift $$$$$$
just feed them constantly
neither. it strengthens the muscles in your butt. which could mean a smaller butt for fatter people since building muscle lowers fat cells' sizes, and could mean a bigger butt for skinner body types because there is no fat, and the muscle is building.
Like the Sims 2, Force them to eat when they're not hungry and don't let them exercise.
no
Feed it while it is full