Definition of fatty noun from the Oxford Advanced American Dictionary

 

fatty

 noun
noun
NAmE//ˈfæt̮i//
 
(pl. fatties)(also fatso)(informal)(disapproving)
 
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a fat person The United States has become a nation of fatties. “Hey, Fatty, bring us another beer.”Word Familyfat adjectivefatty adjectivefatten verbfattening adjective
See the Oxford Advanced Learner's Dictionary entry: fatty