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

 

fatty

 noun
noun
BrE BrE//ˈfæti//
 
; NAmE NAmE//ˈfæti//
 
 
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(pl. fatties) (also fatso) (informal, disapproving) a fat person Britain is fast becoming a nation of fatties. ‘Hey, Fatty, bring us another beer.’Word Familyfat adjectivefatty adjectivefatten verbfattening adjective
See the Oxford Advanced American Dictionary entry: fatty