[ fat-ee ]
See synonyms for fatty on Thesaurus.com
adjective,fat·ti·er, fat·ti·est.
  1. consisting of, containing, or resembling fat: fatty tissue.

  2. Pathology. characterized by overproduction or excessive accumulation of fat.

Origin of fatty

Middle English word dating back to 1350–1400; see origin at fat, -y1

Other words from fatty

  • fat·ti·ly, adverb
  • fat·ti·ness, noun

Other definitions for fatty (2 of 2)

[ fat-ee ]

noun,plural fat·ties.Informal.
  1. Disparaging and Offensive. a person who is overweight or obese (sometimes used as a term of address).

  2. a large marijuana cigarette, often shared and consumed by a group, with a shape and size similar to a cigar.

Origin of fatty

First recorded in 1790–1800 (def. 1); 2003 (def. 2); see origin at fat, -y2

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fatty in a sentence

  • This professional seducer, of sorts, has been pictured holding a T-shirt reading “Diss Fatties, Bang Hotties.”

  • You know that these fatties actually follow me around on the net now, asking me questions in message boards about engineering?

    Makers | Cory Doctorow
  • Lester was more interested in what people had to say on the engineering message-boards than chatting with the fatties.

    Makers | Cory Doctorow

British Dictionary definitions for fatty


/ (ˈfætɪ) /

adjective-tier or -tiest
  1. containing, consisting of, or derived from fat

  2. having the properties of fat; greasy; oily

  1. (esp of tissues, organs, etc) characterized by the excessive accumulation of fat

nounplural -ties
  1. informal a fat person

Derived forms of fatty

  • 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