Definition of fatso noun from the Oxford Advanced Learner's Dictionary

 

fatso

 noun
noun
BrE BrE//ˈfætsəʊ//
 
; NAmE NAmE//ˈfætsoʊ//
 
(pl. fatsoes)= fatty
 
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Word Origin 1940s: probably from the plural of fat (in the sense ‘fat person’) + -o.
See the Oxford Advanced American Dictionary entry: fatso

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