Top Definition
A medium pizza, rolled up and deep-fried. It is officially called a pizza roll. Usually ordered when intoxicated. The favorite food of drunk St. Lawrence University students. If eaten sober, the first few bites tend to taste quite delicious. The same can't be said about the last few bites. THE ultimate diet killer, hence the name "fatbag."
"I was so drunk last night, I called Sergi's and ate a whole fatbag by myself."
by Larry and Muffy March 11, 2006
bags o fat hanging from the elbows or knees, and in serious cases hanging from the chin
did you see her arms?

yeah she's got total fat bags
by strydy ho September 14, 2009
(Noun, pl) Tits that are actually just bags of fat; they are totally shapeless, and can only be found on fat people. They frequently cause boner whiplash.
Susan: You have way bigger boobs than I do!
Mindy: No, your boobs are way bigger because they are not even boobs, they are fatbags.
by lechatquirit March 11, 2009
breasts, boobs, tits, honkers, hooters, melons and shabadooo's
Guy 1: look at the fat bags on that one!!!
Guy 2: Very nice!!!
by wex November 02, 2003
Fatbag is another word for a shopping bag stuffed with - often discounted - products. A fatbag is stuffed to a level where it almost breaks, thus looking like a fatbag.
He carried a fatbag out of the shop as he had made many good bargains.
by Syl Sammy October 23, 2015
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