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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
Middle English word dating back to 1350-1400; See origin at 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 (sometimes used as a term of address).
a large marijuana cigarette, often shared and consumed by a group, with a shape and size similar to a cigar.
1790-1800 for def.1; 2003 for def. 2; fat-y2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for fatty
Contemporary Examples
Historical Examples
  • Well, fatty went to bed, in one of the hay bunks, pretty soon after that.

    The Depot Master Joseph C. Lincoln
  • I reached the dock ha'f an hour after they did, and there was fatty waitin' for me.

    The Depot Master Joseph C. Lincoln
  • They in effect accuse him of fatty degeneration of the brain.

    Ireland as It Is Robert John Buckley (AKA R.J.B.)
  • "Say, fatty, you should have gone into it just to lose flesh," was Andy's dry comment.

  • My fatty is not used to such a burden as I fear Mr. Sutherland would prove.

    David Elginbrod George MacDonald
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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