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(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.
Fatbags by lechatquirit March 11, 2009
Related Words
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."
Fatbag by Larry and Muffy April 16, 2006

fagbagster 

A new species originating in Asia of straight "men" who attempt to look as gay as possible, complete with frosted tips, eyeliner, and scarves tied around their necks even in tropical weather. Combining the fashion sense of hipsters with the self absorbtion of doucebags, the fagbagster is often seen in the company of hot Asian women who are dying inside for a real man who spends less time in front of a mirror than they do.
Look at that hot chick over there looking bored to tears with her fagbagster boyfriend.
fagbagster by BorisSDT August 7, 2011

Fatbagger 

A fatbagger is a bargain hunter buying large amounts of products (often expensive brands and products) when they are on sale. From the meaning of filling a big shopping bag with products making the bag a fat bag.
As a real fatbagger he enjoyed shopping big when the price was right
Fatbagger by Syl Sammy October 23, 2015

Fatbastard 

To eat junk food by placing a similar, but slightly different, piece of junk food on top of it. The eater then proceeds to bite both in one motion, hence completing a full fatbastard.
Damn, did you see Sean fatbastard those two doughnuts? Chocolate and Vanilla frosting for the win!
Fatbastard by Crazy Legs February 24, 2006
breasts, boobs, tits, honkers, hooters, melons and shabadooo's
Guy 1: look at the fat bags on that one!!!
Guy 2: Very nice!!!
fat bags by wex November 2, 2003