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[fat-ee] /ˈfæt i/
adjective, fattier, fattiest.
consisting of, containing, or resembling fat:
fatty tissue.
Pathology. characterized by overproduction or excessive accumulation of fat.
Origin of fatty1
1350-1400; Middle English; see fat, -y1
Related forms
fattily, adverb
fattiness, noun


[fat-ee] /ˈfæt i/
noun, plural fatties. Informal: Disparaging and Offensive.
a person who is overweight or obese (used as a term of address).
1790-1800; fat + -y2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for fatty
Contemporary Examples
Historical Examples
  • "Not together—not together," said the dismal voice of fatty Harris.

    The Varmint Owen Johnson
  • He grabbed up a handful of green peas and tossed them to fatty.

    The Tale of Jimmy Rabbit Arthur Scott Bailey
  • He broke off to mix another drink, and fatty took up the tale.

    The Red One Jack London
  • And then with all his might he threw the turnip straight at fatty Coon.

    The Tale of Jimmy Rabbit Arthur Scott Bailey
  • "I'm not, neither," fatty shouted very angrily and ungrammatically.

    Half-Past Seven Stories Robert Gordon Anderson
British Dictionary definitions for fatty


adjective -tier, -tiest
containing, consisting of, or derived from fat
having the properties of fat; greasy; oily
(esp of tissues, organs, etc) characterized by the excessive accumulation of fat
noun (pl) -ties
(informal) a fat person
Derived Forms
fattily, adverb
fattiness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fatty

late 14c., from fat + -y (2). As a name for a fat person, attested by 1797 (with -y (3)).

Online Etymology Dictionary, © 2010 Douglas Harper
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fatty in Medicine

fatty fat·ty (fāt'ē)

  1. Containing or composed of fat.

  2. Characteristic of fat; greasy.

  3. Derived from or chemically related to fat.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Slang definitions & phrases for fatty



  1. A fat person: designed to keep all us fatties from committing hara-kiri (1797+)
  2. A thick marijuana cigarette (1980s+ Narcotics)
The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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