YOU SAID:

Yo mama so fat she built like the sun

INTO JAPANESE

ママはとても太っていて、太陽のように体格が良かった

BACK INTO ENGLISH

Mom was very fat and fit like the sun.

INTO JAPANESE

お母さんはとても太っていて、太陽のように健康でした。

BACK INTO ENGLISH

Mom was very fat and healthy as the sun.