Etymology
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fatty (adj.)

late 14c., from fat + -y (2). As a name for a fat person, attested by 1797 (with -y (3)).

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Definitions of fatty
1
fatty (n.)
a rotund individual;
Synonyms: fatso / fat person / roly-poly / butterball
2
fatty (adj.)
containing or composed of fat;
fatty food
Synonyms: fat
From wordnet.princeton.edu