Just a random insult. Combining "Fart" and "Ass." Or accusing one of passing too much anal gas. Not an insult to be taken to heart, however. Fun times.
People of epic proportion (in size), also a Fatakins is usually an ugly and obnoxious person as well as fat. The Fatakin species usually hangs around large piles of grease or "McDonalds". Though the Fatakins are able to adapt to many of their surroundings, they cannot adapt to the mold that grows under their fat flaps along with the 14 week old chicken bone from "Popeyes".
EX 1.
EEEEEEEWWWWWW!!!!! Look at those Fatakins their eating their own skin because it has grease on it.