noun, plural fatsos, fatsoes. Slang.
a fat person (often used as a disparaging and offensive term of address).

1940–45; perhaps Fats a nickname for a fat person (see fat, -s4) + -o; also compared with fat sow, German Fettsau

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World English Dictionary
fatso (ˈfætsəʊ)
n , pl -sos, -soes
slang a fat person: used as an insulting or disparaging term of address

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Slang Dictionary

fatso definition

  1. n.
    a fat person. (Cruel. Also a rude term of address.) : Some fatso tried to get on the plane and couldn't even get through restroom the door!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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