fatso

noun
fat·​so | \ˈfat-(ˌ)sō \
plural fatsoes

Definition of fatso 

informal, disparaging + offensive

: a fat person

First Known Use of fatso

1944, in the meaning defined above

History and Etymology for fatso

probably from Fats, nickname for a fat person + -o

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The first known use of fatso was in 1944

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