Etymology From Middle English fatty, equivalent to fat + -y. Cognate with Saterland Frisian fattig (“fatty”), Dutch vettig (“fatty, greasy”), German Low German fettig (“fatty”), German fettig (“fatty”).
1
Containing, composed of, or consisting of fat.
fatty tissues
fatty meats
1 more example
Then in the case of excisions you have all kinds of secondary changes, pigmentary disturbances, modifications of the passions, alterations in the secretion of fatty tissue.1896, H[erbert] G[eorge] Wells, “Chapter 14”, in The Island of Doctor Moreau (Heinemann’s Colonial Library of Popular Fiction; 52), London: William Heinemann, →OCLC; republished as The Island of Doctor Moreau: A Possibility, New York, N.Y.: Stone & Kimball, 1896, →OCLC:
2
Sometimes, especially, containing excess fat.
fatty liver
fatty pancreas
2 more examples
That means eating fruits and vegetables and cutting back on fatty foods.2002, George W. Bush, Presidential Radio Address - June 22:
As we age, the major arteries of our bodies frequently become thickened with plaque, a fatty material with an oatmeal-like consistency that builds up along the inner lining of blood vessels.2013 July-August, Stephen P. Lownie, David M. Pelz, “Stents to Prevent Stroke”, in American Scientist:
3
Like fat; greasy.
4
Of or related to fat.
fatty acid
fatty alcohol
2 more examples
1849, Hippocrates (Translated by Francis Bacon), Of the Epidemics, Book II, Section 1. On the sixth, stools black, fatty, viscid, fetid; slept, more collected.
[…]which had a greasy and fatty surface like cold broth1860 December – 1861 August, Charles Dickens, “CHAPTER XXXII”, in Great Expectations […], volume (please specify |volume=I to III), London: Chapman and Hall, […], published October 1861, →OCLC:
Be careful of the taxi drivers out there though, I've heard they sell you drugs, drop you off at your hotel and then dob you in to the Thai Police to get a fatty reward!2007, getting rid of weed smell tips:
Instead of going my normal route (ordering the book through the store, checking it out in person, and then ordering it online so I could get a fatty discount) I impulsively bought the book.2007, A. Bryant, Disappointment to Say the Least:
1 more example
I'm trying to get a fatty project done in a couple of hours right now.2007, Rimma http://comments.deviantart.com/4/718221/456809541