Fat Ernie Share definition Flag Fat Ernie 1) another name for taking a giant shit. One that is almost to big to come out and makes you feel hemmrodal and violated when it finally is pushed out. Dude, I took a fat Ernie this morning and it feels like I blew out my o ring. Fat Ernie by Jams gram June 19, 2017 0 0 Get merch Get the Fat Ernie mug. Buy Now — $32.95 See more merch
