Quick definitions from WordNet (fat)

▸ noun:  a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides) ("Pizza has too much fat")
▸ noun:  excess bodily weight ("She found fatness disgusting in herself as well as in others")
▸ noun:  a kind of body tissue containing stored fat that serves as a source of energy; adipose tissue also cushions and insulates vital organs ("Fatty tissue protected them from the severe cold")
▸ verb:  make fat or plump
▸ adjective:  lucrative ("A nice fat job")
▸ adjective:  having a relatively large diameter ("A fat rope")
▸ adjective:  a chubby body ("The boy had a rounded face and fat cheeks")
▸ adjective:  having much flesh (especially fat) ("He hadn't remembered how fat she was")
▸ adjective:  marked by great fruitfulness ("A fat land")
▸ adjective:  containing or composed of fat ("Fatty food")
▸ name:  A surname (very rare: popularity rank in the U.S.: #85271)

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▸ Also see fat