1849, Hippocrates (Translated by Francis Bacon), Of the Epidemics, Book II, Section 1.
On the sixth, stools black, fatty, viscid, fetid; slept, more collected.
(slang) Literally or figuratively large.
I'm trying to get a fatty project done in a couple of hours right now.
noun
(derogatory, slang) An obese person.
It's hardly surprising, when it has to support that enormous gut! Lose some weight, fatty!