Latin for your mom.
The other poster is a noob. Correct Latin for Your mom is so fat, she sits around the house would actually be
tua mater est tam obesa ut ea sedeat in domo.
circum not only takes an accusative noun, but cannot be used to mean around in this context.
tua mater is Latin for "your mom"
tua mater tam magna est ut ea circum domo sedeat (Your mom is so fat, she sits around the house.)