fat-ass

noun2

1. •
   (vulgar, offensive) A rotund, overweight, or obese person.

   • He is such a fat-ass he can barely put his feet together.
2. •
   (vulgar, offensive) A jibe used on someone disliked, frequently someone regarded as lazy.

   • My boss is a fat-ass who doesn't know his job as well as I do.
   • Yes, your whole department is full of fat-asses.