A Kluck Fuck that is extremely flat in the ass but fat in the sass. Typically eats 3 entrees for breakfast, lunch, and dinner. A Fat Aus can be seen in the wilderness but on rare occasions can be seen holding the same beer for three hours in the corner of your favorite local bar.
"Did you just get a three stack of pancakes with your huevos rancheros? You a mother fuggin Fat Aus."
by Gemma369 October 10, 2017